The Defense Playbook: The Strongest Likely Opposing Arguments, Claim by Claim — What Each Defense Means, What Supports It, What Weakens It, Who Bears the Burden, and What Governs It

Group One — Threshold defenses#

Wrong defendant

What it means. The entity or person named is not the one that employed the plaintiff, treated the patient, operated the facility, or made the decision; the right one is someone else, perhaps someone not named and perhaps someone now protected by a limitation period, a discharge, or an immunity.

Facts that tend to support it. The named entity's name appears on no hiring notice, wage statement, W-2 or contract; another entity's name appears on all of them; the named entity was a holding company, a brand owner, or a management company without employees at the facility; the clinician who treated the patient was employed by a professional corporation or a staffing agency rather than the named contractor; the decision was made by a county official rather than the contractor's staff.

Facts that tend to weaken it. The entity supervised, paid, disciplined or made the challenged decision, with contemporaneous records linking that conduct to the exact legal person; the entity undertook relevant contractual duties; reliable filings identify its role; distinct entities may each have legally supported bases for liability. A § 2810.5 notice, § 226(a)(8) wage statement, W-2, public-facing brand or county contract is evidence of a particular role, not conclusive proof of FEHA, federal, professional-negligence or § 1983 liability. The entity name, legal status, dates and alleged act must be proven separately.

Burden. The plaintiff must plead and prove the facts making the defendant liable in the role alleged; the defendant raises the defect by demurrer, motion to dismiss, or summary judgment.

Authority. Roadmaps 003, 004, 094; Lab. Code §§ 2810.5, 226(a)(8), 2810.3 (AR-094-S01–S02; AR-033-S02); Corp. Code § 1502 (AR-094-S04); Code Civ. Proc. § 474 (Doe pleading, not opened) and the relation-back rules (counsel question); the public bankruptcy record on entity structure (AR-096-E01; AR-090-E01–E02).

No employment relationship (independent contractor; joint employer; integrated enterprise)

What it means. The plaintiff was not the defendant's employee: the plaintiff was an independent contractor; or was employed by another entity and the defendant was neither a joint employer nor part of an integrated enterprise with the employer.

Facts that tend to support it. A written independent-contractor agreement; payment by 1099; the worker's control over hours, methods and other engagements; the worker's own professional corporation; for a physician, the Borello factors pointing to independence (Lab. Code § 2783 removes physicians from the ABC test); for joint-employer theories, the absence of control over hiring, firing, pay and supervision.

Facts that tend to weaken it. Control over the manner and means of work; integration into the defendant's regular business; set schedules, protocols and supervision; W-2 payment; an offer letter and handbook; for FEHA and the ADA, the defendant's exercise of control over the terms and conditions of the plaintiff's employment; for Clackamas purposes, the physician's lack of ownership, control or participation in governance; for § 2810.3, the defendant's use of a labor contractor to supply the worker.

Burden. Under the Labor Code's ABC test, the hiring entity bears the burden of establishing independent-contractor status (Lab. Code § 2775(b)(1)); under Borello, the hiring entity's control is the principal factor and the burden allocation is a counsel question; under FEHA and the ADA, the plaintiff must plead and prove the employment relationship.

Authority. Roadmaps 012 (Clackamas, AR-012-C01), 094, 095 (Lab. Code §§ 2775, 2783, AR-095-S02–S03); Martinez v. Combs and Vernon v. State (AR-C21, AR-C22, R1 pending) on joint employment; Borello and Dynamex (not opened).

Limitations

What it means. The claim was filed after the period the statute allows, measured from the trigger the statute sets, and no tolling applies.

Facts that tend to support it. A discrete act (termination; denial) on a date well before the filing; a charge or complaint filed after the administrative period; a Government Claims Act claim presented more than six months after death or injury; a suit filed more than 90 days after receipt of a right-to-sue notice or more than a year after a CRD notice; no facts supporting discovery-rule accrual or equitable tolling.

Facts that tend to weaken it. The legally operative date differs from the asserted one (a later communication may or may not be the accrual event, and a renewed refusal is not automatically a new actionable act); a continuing violation where the law recognizes one (harassment; a continuing failure to accommodate — a counsel question under Richards v. CH2M Hill, not opened); statutory tolling (Gov. Code § 12965's provisions; 28 U.S.C. § 1367(d); Code Civ. Proc. § 364(d); § 352.1 for imprisonment, unsettled as to pretrial detention); the FEHA employer-identity extension in Gov. Code § 12960(e)(6); timely presentation of a claim or charge the defendant overlooked.

Burden. Limitations is an affirmative defense the defendant must plead; where the complaint shows untimeliness on its face the defendant may raise it by demurrer or motion; the plaintiff bears the burden of establishing tolling or delayed accrual once the defense is shown.

Authority. Roadmap 008; Roadmap 096.1's deadline-source rows; Code Civ. Proc. §§ 335.1, 337, 338, 339, 340, 340.5, 364 (AR-010-S02–S04; AR-021-S04–S05; AR-096-S04–S05); Gov. Code §§ 12960, 12965 (AR-010-S06–S07; AR-S927); 42 U.S.C. § 2000e-5(e)(1), (f)(1) (AR-023-S06; AR-S607); Gov. Code §§ 911.2, 945.6 (AR-096-S01, S03); Pineda (AR-026-C04); Wallace v. Kato (AR-C07); § 352.1 authorities (AR-S603; AR-C49–C51).

Failure to satisfy an administrative prerequisite (exhaustion, claim presentation, notice)

What it means. The claim required a step before suit, and the step was not taken, was taken late, or did not cover what the lawsuit alleges. The series uses "administrative prerequisite" as the umbrella term (Glossary 147) and keeps the narrower names, because the steps differ in kind and in consequence. Exhaustion is kept for completing an administrative remedy: a prisoner's exhaustion of available jail or prison grievance remedies before a federal action about prison conditions (42 U.S.C. § 1997e(a), AR-096-F04; availability under Ross v. Blake, AR-0961-C09; Roadmap 080), and the agency charge process — an EEOC charge or a CRD complaint — before a discrimination suit. Claim presentation is the Government Claims Act step: a written claim presented to the public entity, and rejected or deemed rejected, before a suit for money or damages against the entity or its employees (Roadmap 078). Notice is the Code Civ. Proc. § 364 step: written notice of intent at least ninety days before an action based on a health-care provider's professional negligence (AR-096-S04; Roadmap 066). A PAGA notice and an ERISA plan appeal keep their own names. A defendant may raise more than one of these at once, and an answer to one is not an answer to another: a § 364 notice served on a county is not a Government Claims Act claim, although a notice that reaches a public entity may be treated as a defective "claim as presented" that triggers the entity's duty to give notice of insufficiency (Roadmap 078).

Facts that tend to support it. No charge or complaint; a charge naming a different respondent; a charge alleging a different basis or different acts than the lawsuit; a grievance abandoned at the first level; a claim presented to the wrong public entity; no § 364 notice; no plan appeal.

Facts that tend to weaken it. A timely charge or complaint whose scope reasonably encompasses the lawsuit's claims; a right-to-sue notice; a grievance pursued through every available level, or facts showing unavailability under Ross v. Blake; a claim presented and rejected; a § 364 notice served; for § 1102.5, § 1278.5, Tameny, contract, wage, FMLA and § 2056 claims, that no exhaustion is required at all.

Burden and procedural consequence (do not conflate). California CRD complaint/right-to-sue compliance must be evaluated for a private FEHA action; the CRD describes a general three-year administrative filing period and one-year period after its right-to-sue notice, subject to statute-specific exceptions. Federal Title VII charge filing is a mandatory but nonjurisdictional claim-processing rule, forfeitable if not timely asserted by the defendant (Fort Bend County v. Davis, 587 U.S. 541 (2019)); it is not a jurisdictional pleading trap. Federal EEOC right-to-sue and ordinary 90-day filing rules are distinct from California CRD notices. PLRA nonexhaustion is an affirmative defense: the defendant bears the ultimate burden of establishing an available but unexhausted remedy, while the prisoner can produce facts showing unavailability (Jones; Albino; Williams v. Paramo). Government Claims Act presentation ordinarily must be pleaded for applicable state-law public-entity damages claims, subject to exceptions and statutory notice/rejection rules. Section 364 medical-negligence notice has its own consequences and conditional timing extension; do not treat it as a Government Claims Act claim.

Authority. Official Fort Bend County v. Davis (2019) and official Ninth Circuit Albino v. Baca (en banc 2014); CRD and EEOC official public guidance (October 2026 checks); Roadmaps 008, 021 (§ 244(a), AR-021-S02; Satyadi, AR-021-C01), 034, 035, 066 (§ 364 notice), 078 (claim presentation, controlling), 080 (PLRA exhaustion, controlling), 096.1 Families A, J, I; defense playbook 135; 42 U.S.C. § 1997e(a) (AR-096-F04); Ross v. Blake (AR-0961-C09); Jones v. Bock (AR-080-C04); Woodford v. Ngo (AR-080-C03) on proper exhaustion; Gov. Code § 945.4 (AR-096-S02); Code Civ. Proc. § 364 (AR-096-S04); Lab. Code § 2699.3 (AR-0261-S02); 29 C.F.R. § 1601.28 (AR-125-F02).

Arbitration

What it means. The moving party contends that an enforceable agreement formed under applicable law, binds the relevant parties, and covers the claims. Signature is not the only possible way to show assent, nor proof of enforceability by itself. A court must test threshold formation and legally applicable defenses before ordering arbitration. Whether a stay must be entered if requested is governed by 9 U.S.C. § 3 and controlling decisions, not an automatic dismissal.

Facts that tend to support it. A signed arbitration agreement; an agreement with a clear delegation clause; the claims within its scope; the agreement governed by the Federal Arbitration Act; no unconscionability.

Facts that tend to weaken it. No reliable proof of assent, unconscionability where the applicable standard is satisfied, exclusions, waiver, or a dispute outside the agreement. PAGA representative and individual components require claim/date-specific treatment after Viking River, Adolph and California legislative changes; do not call all PAGA claims categorically nonarbitrable. Under 9 U.S.C. §§ 401–402, at the election of the person alleging a covered sexual-harassment or sexual-assault dispute, qualifying predispute arbitration agreements or joint-action waivers cannot be enforced for a case relating to that dispute. The statute applies to disputes or claims arising or accruing on or after March 3, 2022; the court decides applicability notwithstanding a delegation clause. Do not extrapolate that rule to unrelated disputes without claim-specific analysis.

Burden. The party seeking arbitration must prove the agreement by a preponderance; the party resisting must prove the defense to enforcement.

Authority. U.S. House 9 U.S.C. §§ 401–402 (preliminary official text checked 2026-10-16); Roadmap 029; 9 U.S.C. § 2 (AR-S936, inherited/unreopened); Iskanian, Viking River, Adolph (AR-0261-C03, C02, C01); the Labor Code § 432 right to a copy of the signed agreement (AR-033-S03), which is how the plaintiff finds out what was signed.

Bankruptcy discharge, injunction and plan releases

What it means. The defense must identify the specific debtor, the nature and timing of the particular claim, the plan/effective-date provisions, and any operative confirmation, injunction, insurance or claims-process order. The bankruptcy filing, plan confirmation and discharge are not interchangeable events. Nondebtor releases require independently valid legal and consensual support; a plan caption or brand name does not itself release a distinct professional corporation, county or individual. The Supreme Court in Harrington v. Purdue Pharma L.P. (2024) rejected nonconsensual releases of direct claims against nondebtors in the type of Chapter 11 plan before it; whether a particular release survives is an order- and posture-specific question. A purportedly derivative claim requires independent standing/property-of-estate analysis.

Facts that tend to support it. Verified debtor legal name and chapter/plan identity; applicable claim-classification and timing provisions; valid notice and bar-date evidence; authenticated plan and confirmation order that actually reaches this claim; if a nondebtor release is asserted, specific proof of legally sufficient consent rather than mere absence of an opt-out; or established estate ownership of a derivative claim. A prepetition date or missing proof of claim alone does not resolve allowance, discharge, due process, insurance, administrative expense, or nondischargeability. Historical Wellpath dates elsewhere in the corpus are leads until matched to operative orders.

Facts that tend to weaken it. The defendant is not in the debtor list (a county; a professional corporation; "California Forensic Medical Group, Inc." as such, whose name does not appear in the notice); the conduct post-dates the effective date of May 9, 2025; a proof of claim was filed; the claim is one the plan treated as proceeding against insurance; the plaintiff opted out, or the release is non-consensual and barred by Purdue Pharma; the claim is a governmental police-or-regulatory proceeding; the claim is the plaintiff's own direct claim rather than a derivative one.

Burden. The defendant asserting discharge or injunction must establish it from the plan and the confirmation order; the plaintiff resisting must show the claim's timing, the defendant's non-debtor status, or the release's inapplicability. Contempt of a discharge injunction requires no fair ground of doubt (Taggart).

Authority. Roadmaps 090, 091, 096.1 Family L; 11 U.S.C. §§ 362(a), 524(a), (e), 1141(d) (AR-096-F01–F02; AR-090-F01); Purdue Pharma (AR-091-C01); Taggart (AR-091-C02); the confirmation order (AR-091-E01); the H.I.G. opinion (AR-090-C01); the notice and bar-date orders (AR-096-E01; AR-090-E03).

Real party in interest; capacity; the wrong plaintiff

What it means. The person suing does not own the claim: a relative outside Code Civ. Proc. § 377.60's list sues for wrongful death; a survival claim is brought by someone who is neither the personal representative nor the successor in interest; an employee sues on a claim that belongs to a PAGA representative or the state; a patient's family member sues for the patient's injury while the patient lives.

Facts that tend to support it. The plaintiff's relationship to the decedent is outside the statute; no § 377.32 declaration; no appointment as representative; the claim is derivative of the estate.

Facts that tend to weaken it. The plaintiff is within § 377.60(a) or (b); the declaration is filed; letters of administration issued; the claim is the plaintiff's own (a parent's familial-association claim, where recognized).

Burden. The plaintiff must plead and prove the capacity in which the plaintiff sues.

Authority. Code Civ. Proc. §§ 377.30, 377.60 (AR-0961-S06, S05); § 377.32 (not opened); Roadmap 129.1.

Group Two — Employment defenses#

Legitimate, non-discriminatory (or non-retaliatory) business reason

What it means. The adverse action was taken for a lawful reason — performance, misconduct, restructuring, budget, a position elimination — and not because of the protected status or activity.

Facts that tend to support it. Contemporaneous documentation of the reason predating the protected activity; a consistent reason stated to the employee, to EDD, in the position statement and in litigation; similar treatment of others without the protected characteristic; a decisionmaker without knowledge of the protected activity; a reduction in force affecting others.

Facts that tend to weaken it. Timing close to the protected activity; shifting or inconsistent reasons across forums (the personnel file, the EDD statement, the position statement, the deposition); the absence of prior documentation; deviation from the employer's own progressive-discipline policy; the position filled rather than eliminated; comparators treated better; the decisionmaker's knowledge established.

Burden. Under the McDonnell Douglas framework as California applies it (Guz), the plaintiff makes a prima facie showing, the employer articulates a legitimate reason, and the plaintiff must then show the reason is pretextual or that discrimination was a substantial motivating factor; under § 1102.6 the framework is different (next entry).

Authority. Roadmaps 010, 013, 019, 036; Guz (AR-010-C08); Harris (AR-010-C10); Yanowitz (AR-019-C01); Reeves v. Sanderson Plumbing (AR-C69, R1 pending) on pretext evidence.

Same decision (mixed motive)

What it means. Even if a protected characteristic was a substantial motivating reason, the employer would have made the same decision for legitimate reasons, which under FEHA limits the remedies to declaratory and injunctive relief and fees and bars damages, back pay and reinstatement.

Facts that tend to support it. Documented misconduct or performance problems independent of the protected characteristic; a policy consistently applied; others terminated for the same conduct.

Facts that tend to weaken it. The legitimate reason was not invoked at the time; others with the same conduct were retained; the reason was pretextual.

Burden. The employer bears the burden of proving the same-decision defense by a preponderance once the plaintiff proves the protected characteristic was a substantial motivating factor (Harris). Under § 1102.6 the employer's burden is clear and convincing evidence that it would have taken the action for legitimate, independent reasons (Lawson).

Authority. Harris (AR-010-C10); Lab. Code § 1102.6 (AR-020-S02; AR-023-S02); Lawson (AR-020-C01); Roadmaps 013, 021.

No disability; not a qualified individual

What it means. The plaintiff's condition is not a disability within the ADA or FEHA (or the employer did not regard it as one); or the plaintiff could not perform the essential functions of the position with or without reasonable accommodation.

Facts that tend to support it. A transient, minor condition; no limitation of a major life activity (ADA) or of a major life activity made difficult (FEHA's broader standard); medical restrictions that preclude an essential function with no accommodation that would permit it; the employee's own statements that they cannot work at all (which may be reconciled, counsel question).

Facts that tend to weaken it. The condition limits a major life activity as defined, including under the ADA Amendments Act's broad construction (42 U.S.C. § 12102, AR-012-S01) and FEHA's "limits" standard (Gov. Code § 12926; 2 C.C.R. § 11065); the employer treated the employee as impaired; the essential functions were performed with or without accommodation; the "essential" function was marginal or was not required of others; a clearance to return with or without restrictions.

Burden. The plaintiff must prove disability and qualification; the employer's characterization of essential functions is given consideration but is not conclusive (2 C.C.R. § 11065(e), AR-013-R01; 29 C.F.R. § 1630.2(n), AR-012-R01).

Authority. Roadmaps 012, 013, 016; Nunes (AR-012-C03); Gelfo (AR-013-C03); Green v. State (AR-013-C01) on the plaintiff's burden to show qualification under FEHA.

No notice; no request for accommodation

What it means. The employer did not know of the disability or of the need for accommodation, so it could not have discriminated because of it or failed to accommodate it.

Facts that tend to support it. No written request; no medical documentation provided; the employee's statements that nothing was wrong; the decisionmaker's lack of knowledge.

Facts that tend to weaken it. Written or otherwise documented notice of work limitations and possible accommodation needs, medical restrictions communicated through permitted channels, an obvious need, an employer inquiry showing actual awareness, a request for leave or an interactive-process exchange. A fitness-for-duty referral or a leave record may show knowledge of a work concern, but is not automatically proof that the employer knew a statutory disability or the particular accommodation needed. Different decisionmakers and dates may matter; clinical diagnostic detail need not be publicly reproduced to prove notice.

Burden. The plaintiff must prove the employer's knowledge; the employer attacks it.

Authority. Roadmaps 014, 015; 2 C.C.R. § 11069 (AR-015-R01) on when the interactive process is triggered; Scotch (AR-015-C01); Featherstone (AR-015-C02) on the limits of the duty where the employee did not disclose.

No reasonable accommodation available; undue hardship

What it means. No accommodation existed that would have allowed the plaintiff to perform the essential functions; or the only accommodations would have imposed significant difficulty or expense on the employer.

Facts that tend to support it. Documented analysis of the requested accommodation; the cost and operational impact in relation to the employer's size and resources; the accommodation would eliminate an essential function or require creating a new position; no vacant position for reassignment; safety or regulatory constraints.

Facts that tend to weaken it. The accommodation was granted to others; the employer never analyzed hardship; the employer is large; the accommodation was inexpensive (a schedule change; a modified duty the employer provides to workers'-compensation returnees); vacant positions existed; the employer's own policies provided for the accommodation.

Burden. Under FEHA, undue hardship is an affirmative defense the employer must prove (2 C.C.R. § 11068, AR-014-R01); under the ADA, the employer bears the burden on undue hardship, and the plaintiff must show a reasonable accommodation was available (U.S. Airways v. Barnett, AR-014-C02; Nadaf-Rahrov, AR-014-C01).

Authority. Roadmap 014; the regulations cited.

Breakdown of the interactive process caused by the employee

What it means. The employer engaged in good faith, and the process failed because the employee did not respond, did not provide requested information, or rejected reasonable alternatives.

Facts that tend to support it. Documented requests for information unanswered; the employee's refusal of offered accommodations; the employee's unavailability.

Facts that tend to weaken it. The employer's requests were unreasonable or sought more than the law permits (Roadmap 017); the employer's silence after the request; the employer's unilateral decision without discussion; the offered accommodation was not reasonable.

Burden. Under FEHA, the plaintiff must prove the employer failed to engage; responsibility for a breakdown is assessed on the facts (Scotch; Nadaf-Rahrov); the employer must participate in good faith (2 C.C.R. § 11069).

Authority. Roadmap 015; AR-015-R01; AR-015-C01–C03.

Direct threat; safety-based exclusion

What it means. The employee posed a significant risk of substantial harm to the health or safety of the employee or others that could not be eliminated or reduced by reasonable accommodation, so excluding the employee was lawful.

Facts that tend to support it. An individualized assessment based on current medical knowledge and the best available objective evidence, considering duration, nature and severity, likelihood and imminence (Chevron v. Echazabal, AR-018-C01; 42 U.S.C. § 12113, AR-018-S01; 2 C.C.R. § 11067, AR-018-R01); a physician's opinion addressing the specific job; a safety-sensitive position.

Facts that tend to weaken it. A generalized or stereotyped judgment; no individualized assessment; a clearance from the employee's physician that the employer ignored; the risk could be reduced by accommodation; the employer applied the exclusion inconsistently.

Burden. Direct threat is an affirmative defense the employer must prove under both the ADA and FEHA (Dark v. Curry County, AR-018-C02; 2 C.C.R. § 11067).

Authority. Roadmap 018.

No protected activity

What it means. What the employee did was not protected: it was not a complaint about a practice the statute forbids; it was a complaint about ordinary workplace disagreements; the disclosure was of information the employer already knew (which the Legislature addressed in § 1102.5(e), not analyzed here); the report was not to a person or agency the statute names; the employee did not have reasonable cause to believe a violation occurred.

Facts that tend to support it. A complaint about management style, workload or personality; no reference, express or implied, to a legal violation; a report to an outside party the statute does not cover; an unreasonable belief.

Facts that tend to weaken it. A contemporaneous report identifying facts the worker reasonably believed disclosed a violation of an applicable statute, rule or regulation, or noncompliance with a covered public-body rule; a recipient qualifying under the asserted statute; protected opposition or participation under FEHA/Title VII, or an accommodation request protected by the relevant disability law. Patient safety, staffing or management objections are not automatically § 1102.5 disclosures merely because the speaker is a physician; identify the actual legal rule, the reasonable-belief basis and whether the report was protected. Keep separately protected participation and requests distinct from whistleblower disclosures.

Burden. The plaintiff must prove protected activity.

Authority. Roadmaps 019–023; Lab. Code § 1102.5(b) (AR-020-S01; AR-023-S01); Yanowitz (AR-019-C01); T.B. ex rel. Brenneise (AR-019-C02); Health & Saf. Code § 1278.5 (AR-011-S03); Bus. & Prof. Code § 2056 (AR-011-S02).

No causation; no retaliatory knowledge

What it means. The opposing party contends that the legally relevant decision chain lacked knowledge or causal connection. The causal standard depends on the precise cause of action and theory—for example, § 1102.6 uses contributing-factor and same-decision burden shifting, while FEHA discrimination and retaliation, federal Title VII retaliation, and ADA retaliation require separate authority-sensitive analysis. Do not apply a single FEHA or ADA causation shorthand to every discrimination, accommodation and retaliation theory.

Facts that tend to support it. The decisionmaker's documented lack of knowledge; a long interval; an intervening event supplying the reason; the decision was in motion before the protected activity.

Facts that tend to weaken it. Temporal proximity; the decisionmaker's knowledge established by documents; a pattern of antagonism after the activity; the "cat's paw" of a biased recommender influencing an unknowing decisionmaker (Staub, AR-C15, R1 pending; Reeves v. Safeway, AR-C16, R1 pending); shifting reasons.

Burden. The plaintiff proves causation under the standard the statute sets; under § 1102.6 the burden shifts to the employer once a contributing factor is shown.

Authority. Roadmaps 005, 019, 021; Murray (AR-012-C02); Harris (AR-010-C10); Lawson (AR-020-C01); CACI 2505 (AR-019-J01).

Workers' compensation exclusivity

What it means. The injury is one for which workers' compensation is the exclusive remedy (Lab. Code §§ 3600, 3602), so the civil claim is barred.

Facts that tend to support it. A physical or psychiatric injury arising out of and in the course of employment, including injury from ordinary personnel actions; a claim for the injury itself rather than for discrimination.

Facts that tend to weaken it. The claim is for discrimination, retaliation or wrongful termination in violation of public policy, which are not within the compensation bargain (City of Moorpark, AR-010-C07); the conduct falls within a statutory exception (§ 3602(b)); the claim is a § 132a claim before the WCAB; the employer failed to secure compensation (§ 3706, not opened).

Burden. The defendant pleads exclusivity; the plaintiff shows the claim falls outside it.

Authority. Roadmap 037.1; Lab. Code §§ 3600, 3602, 132a (AR-0371-S01–S03); Moorpark (AR-010-C07); Cole (AR-0371-C02).

Failure to mitigate

What it means. The plaintiff did not make reasonable efforts to find comparable employment, so back pay and front pay should be reduced by what the plaintiff could have earned.

Facts that tend to support it. No job search; rejection of comparable offers; withdrawal from the labor market; a long gap with no applications.

Facts that tend to weaken it. A documented search (Worksheet 112); applications and interviews; the unavailability of comparable work; a disability that limited the search; the employer's failure to identify comparable positions that were available.

Burden. The employer bears the burden of proving failure to mitigate, including that comparable employment was available and the plaintiff did not reasonably seek it.

Authority. Roadmap 037; the remedies matrix (096.2); defense playbook 138.

Good-faith dispute as to wages

What it means. For waiting-time penalties under Lab. Code § 203, the employer's failure to pay was not "willful" because a good-faith dispute existed as to whether wages were owed.

Facts that tend to support it. A reasonable legal or factual dispute about whether the amount was a wage (a discretionary bonus; a disputed commission formula); the employer's contemporaneous explanation.

Facts that tend to weaken it. No dispute at the time; a dispute manufactured after the claim; the amount was clearly earned and unpaid.

Burden. The employer must establish the good-faith dispute (Cal. Code Regs., tit. 8, § 13520, AR-026-R01).

Authority. Roadmap 026; Naranjo (AR-026-C02–C03); Schachter (AR-026-C01).

Group Three — Constitutional and correctional defenses#

No state action (private actor)

What it means. The defendant is a private company or private employee not acting under color of state law, so § 1983 does not reach it.

Facts that tend to support it. The defendant's role was unrelated to the governmental function (a billing contractor; an off-site vendor); no contract with the state or county for the care at issue.

Facts that tend to weaken it. The defendant provided medical care to persons in custody under contract with the county, performing the state's constitutional duty: "It is the physician's function within the state system, not the precise terms of his employment, that determines whether his actions can fairly be attributed to the State" (West v. Atkins, 487 U.S. at 55–56).

Burden. The plaintiff must plead and prove action under color of state law.

Authority. Roadmap 046; West (AR-0961-C07); 42 U.S.C. § 1983 (AR-096-F03).

Medical judgment; mere negligence; difference of opinion

What it means. What happened was, at most, a medical mistake or a disagreement about treatment, which is not a constitutional violation: "Medical malpractice does not become a constitutional violation merely because the victim is a prisoner" (Estelle, 429 U.S. at 106); a difference of opinion between the patient and the clinician, or between clinicians, does not establish deliberate indifference (Toguchi, AR-C32, R1 pending).

Facts that tend to support it. The clinician saw the patient, considered the complaint, and chose a course of treatment; documentation of clinical reasoning; a plausible alternative to the treatment the patient wanted; consultation.

Facts that tend to weaken it. No clinician saw the patient despite repeated requests; the chosen course was medically unacceptable under the circumstances and chosen in conscious disregard of an excessive risk (Jett v. Penner, AR-C31, R1 pending); delay without medical reason; failure to follow a specialist's recommendation without reason; for pretrial detainees, the objective Gordon standard, under which the question is whether a reasonable official would have appreciated the high degree of risk.

Burden. The plaintiff must prove the constitutional standard; the defense is an attack on that element.

Authority. Roadmaps 042, 043, 044; Estelle (AR-0961-C02); Farmer (AR-0961-C03); Gordon (AR-0961-C01).

No deliberate indifference (Eighth Amendment subjective knowledge)

What it means. For a convicted prisoner's claim, the defendant did not actually know of a substantial risk of serious harm, or responded reasonably to the risk known.

Facts that tend to support it. The defendant was never told; the symptoms were not communicated or were nonspecific; the defendant acted on what was known; the defendant lacked authority to do more and escalated.

Facts that tend to weaken it. The risk was obvious, from which knowledge may be inferred (Farmer, 511 U.S. at 842); the patient's requests were documented and received; the defendant's own notes show awareness; a pattern of similar failures.

Burden. The plaintiff proves subjective knowledge and disregard; circumstantial evidence suffices (Farmer).

Authority. Roadmap 043; Farmer (AR-0961-C03).

No policy, custom or practice (Monell)

What it means. The county or the contractor cannot be liable because the violation, if any, was an isolated act of an employee, not the execution of an official policy, a widespread custom, a decision by a final policymaker, a ratification, or a deliberately indifferent failure to train or supervise.

Facts that tend to support it. A written policy that, if followed, would have prevented the harm; a single incident; no prior similar incidents or complaints; training provided; prompt discipline of the employee.

Facts that tend to weaken it. A written policy that caused the harm; an entrenched practice established by comparable incidents or reliable operational records; a decision by an actor whose final policymaking authority for the precise challenged issue comes from applicable law or proved corporate delegation (neither a sheriff title nor a contractor's regional-director title automatically establishes such authority); informed adoption of the unconstitutional decision and its basis by a final policymaker, not mere post-event knowledge; a known need for training on a specific recurring risk and a failure to provide it; the "obvious" case where the need is so apparent that the failure is deliberate indifference (City of Canton; Connick — R1 pending).

Burden. The plaintiff must plead and prove policy or custom and moving-force causation; the standard applies equally to private contractors (Tsao).

Authority. Roadmaps 047, 048, 048.1, 049, 050; Monell (AR-0961-C04); Tsao (AR-0961-C08); City of Canton, Connick, Gibson, Oviatt, Trevino (AR-C34, C35, C40, C41, C43, R1 pending).

Isolated incident; no pattern

What it means. A subset of the Monell defense: one bad outcome does not show a custom.

Facts that tend to support and weaken it. As in the preceding entry; the plaintiff's answer is prior incidents from public records (Worksheet 110), the obviousness of the risk, or a single decision by a final policymaker, which needs no pattern (Pembaur, AR-C13, R1 pending).

Qualified immunity

What it means. An individual public official is immune from damages unless the right violated was clearly established at the time such that a reasonable official would have known the conduct was unlawful.

Facts that tend to support it. The defendant is a public employee (a county nurse; a deputy); the specific right in the specific context was not clearly established by precedent; the defendant's conduct was within the range of reasonable responses.

Facts that tend to weaken it. The right was clearly established (the right to adequate medical care in custody has been clearly established since Estelle, and the question is usually whether its application to the specific facts was clear); the conduct was plainly unreasonable; or the defendant is a private contractor's employee whose eligibility for the immunity is itself contested. On that last point no general rule settles the matter. Richardson v. McKnight held that prison guards employed by a private firm managing a prison may not assert the immunity (AR-0961-C10), a holding the Court said it "answered ... narrowly"; Filarsky v. Delia later described Richardson as self-consciously narrow and held that a private individual temporarily retained by the government to carry out its work may seek the immunity (AR-077-C03); and the Ninth Circuit, before Filarsky, denied the immunity to a privately employed psychiatrist working under a county contract (Jensen v. Lane County, AR-062-C02). Whether a clinician employed by a correctional health contractor, or engaged through a professional corporation, can assert it is fact-dependent — it turns on how the clinician was engaged and for what role — and circuit-dependent; Roadmap 077 grades the post-Filarsky question Unsettled/split. Where the immunity is unavailable to a private defendant, a separate good-faith defense may be argued in some circumstances (Roadmap 077).

Burden. The defendant raises the immunity; the plaintiff must show the right was clearly established; the sequence of the two prongs is the court's choice (Pearson v. Callahan, AR-077-C02). A private defendant asserting the immunity must also establish that it is available to a defendant in its position (Roadmap 077).

Authority. Roadmap 077 (controlling); defense playbook 141; Roadmap 045; Richardson (AR-0961-C10); Filarsky (AR-077-C03); Jensen (AR-062-C02); Pearson (AR-077-C02); Estelle (AR-0961-C02); Glossary 147 ("Qualified immunity").

PLRA exhaustion (prisoner plaintiffs)

What it means. The prisoner did not exhaust available administrative remedies before suing, so the federal action must be dismissed.

Facts that tend to support it. No grievance; a grievance not appealed to the final level; a grievance on a different subject; a grievance filed after suit.

Facts that tend to weaken it. A grievance pursued through every level (Worksheet 109); the remedy was unavailable: a "dead end," a scheme "so opaque that it becomes, practically speaking, incapable of use," or officials who "thwart inmates ... through machination, misrepresentation, or intimidation" (Ross v. Blake); the plaintiff was not a prisoner when suit was filed (a counsel question as to the statute's reach).

Burden. A nonjurisdictional affirmative defense: the defendant must prove the existence of an available administrative remedy and failure to exhaust it. The plaintiff may rebut with facts particular to unavailability; the ultimate burden of proof remains on the defendant. In the Ninth Circuit the ordinary vehicle is Rule 56 and, if material factual disputes remain, resolution by the judge (Albino); failure apparent on the complaint face is a narrow dismissal circumstance.

Authority. Official U.S. House 42 U.S.C. § 1997e(a) (through Pub. L. 119-120, October 7, 2026); Albino (official Ninth Circuit en banc opinion, 2014); Williams v. Paramo (Ninth Circuit opinion not directly reopened); Ross (AR-0961-C09); Jones v. Bock (AR-080-C04); Woodford v. Ngo (AR-080-C03; also R1 AR-C37); Roadmaps 040, 041, 080 (controlling); defense playbook 135.

No physical injury (PLRA § 1997e(e))

What it means. Section 1997e(e) limits recovery, in a federal civil action brought by a prisoner confined in a jail, prison or other correctional facility, for mental or emotional injury suffered while in custody absent a prior showing of physical injury or the commission of a sexual act as the statute defines it (42 U.S.C. § 1997e(e), AR-096-F04). In the Ninth Circuit the physical injury need not be significant but must be more than de minimis, and the provision applies only to claims for mental or emotional injury: nominal and punitive damages, and damages for the constitutional violation itself, are not barred as such (Oliver v. Keller, AR-076-C04). The defense therefore narrows the damages a claim can recover; it does not defeat a constitutional-violation claim as such.

Facts that tend to support it. The plaintiff was a confined prisoner when the action was brought; the damages sought are for emotional distress alone; no physical consequence is documented, or the documented injury is de minimis.

Facts that tend to weaken it. Documented physical injury that is more than de minimis, connected to the delay or denial; damages framed for the violation itself and for physical harm, and nominal or punitive damages, which Oliver holds are not barred as such; a plaintiff who was not confined when the action was brought; plaintiffs who are heirs or a successor in interest rather than prisoners (an analytical inference from the statutory text that Roadmap 081 flags as a counsel question).

Burden. The statute requires a prior showing of physical injury for distress damages; the defendant raises the limit by motion as to those damages (Roadmap 081).

Authority. 42 U.S.C. § 1997e(e) (AR-096-F04); Oliver v. Keller (AR-076-C04); Roadmap 081 (controlling); Roadmap 076; defense playbook 138; Glossary 147 ("Physical-injury requirement").

Government Claims Act bar

What it means. The state-law claim against a public entity or public employee was not presented, was presented late, or the suit was filed outside the period after rejection.

Facts that tend to support it. No claim; a claim to the wrong entity; a claim more than six months after accrual for injury or death; a suit more than six months after written rejection.

Facts that tend to weaken it. A timely claim; a timely late-claim application granted or a petition for relief; the defendant is a private contractor to which the Act does not apply; the claim is a federal § 1983 claim, to which state claim-presentation requirements do not apply (Felder v. Casey, AR-C02, R1 pending); the two-year period under § 945.6(a)(2) applies because no written rejection was given; the claim falls within a § 905 exception.

Burden. Compliance is an element the plaintiff must plead; the defendant raises non-compliance.

Authority. Roadmap 096.1 Family J; Gov. Code §§ 905, 911.2, 911.4, 945.4, 945.6 (AR-S501; AR-096-S01; AR-S503; AR-096-S02–S03).

Group Four — Negligence, privilege and damages defenses#

No duty

What it means. The defense disputes a specific source of duty owed by this defendant under the particular cause of action. Common-law professional-negligence duty, a private contractor's undertaking, federal constitutional personal involvement, and California Government Code §§ 844.6/845.6 custodial/public-employee liability cannot be merged into one generic duty inquiry. Section 845.6's failure-to-summon-care exception is distinct from a generalized duty to provide competent treatment; its current official California text and case history remain unverified in this pass.

Facts that tend to support it. The defendant never saw the patient and had no responsibility for the patient's care; the defendant's role was administrative.

Facts that tend to weaken it. The defendant undertook care (an on-call physician who gave orders; a nurse who triaged); the defendant's contractual duty to provide care to the population; Gov. Code § 845.6's duty on public employees who know of a need for immediate care.

Burden. Duty is a question of law on the facts the plaintiff pleads.

Authority. Roadmaps 044, 045; Gov. Code § 845.6 (AR-051-S01).

No breach; standard of care met

What it means. The care met the standard of a reasonably careful practitioner in the same circumstances.

Facts that tend to support it. Expert testimony that the care was within the standard; adherence to protocols; documentation of assessment and reasoning; a complication that occurs without negligence.

Facts that tend to weaken it. Expert testimony to the contrary; departures from the defendant's own protocols; missing assessments; delay without reason; failure to follow up.

Burden. The plaintiff must prove breach by expert testimony except where the matter is within common knowledge.

Authority. Roadmap 044; CACI 500 series (not opened).

No causation (medical)

What it means. Even if the care was deficient, the outcome would have been the same; the delay did not change the result; the condition was not treatable.

Facts that tend to support it. Expert testimony that earlier treatment would not have altered the outcome to a reasonable medical probability; the natural history of the condition.

Facts that tend to weaken it. Expert testimony that timely care would more likely than not have prevented the harm; literature and guidelines on the condition; the treating hospital's findings on presentation.

Burden. The plaintiff must prove causation to a reasonable medical probability.

Authority. Roadmap 044; the 051–099 clinical pages.

Expert failure

What it means. The plaintiff has no qualified expert, the expert's opinion lacks foundation, or the expert was not timely disclosed, so the plaintiff cannot prove breach or causation.

Facts that tend to support it. No expert designated; an expert outside the specialty; an opinion unsupported by the records; late disclosure.

Facts that tend to weaken it. A qualified expert disclosed under Code Civ. Proc. § 2034.210 et seq. (not opened) or Fed. R. Civ. P. 26(a)(2) (not opened), with a foundation in the records.

Burden. The plaintiff's.

Authority. Roadmap 044; Model 129.1.

Comparative fault

What it means. The patient's own conduct (refusing care; not reporting symptoms; non-adherence) contributed to the harm and reduces recovery.

Facts that tend to support it. Documented refusals; missed appointments the patient controlled; concealment of symptoms.

Facts that tend to weaken it. The "refusal" was a refusal of inadequate care; access to care was controlled by custody; the patient's condition impaired judgment; the patient reported symptoms repeatedly.

Burden. The defendant must plead and prove comparative fault.

Authority. Roadmap 044 (comparative fault; not separately opened).

Peer-review privilege (Evid. Code § 1157 immunity from discovery)

What it means. The defendant argues that review records — committee minutes, a mortality review, a root-cause analysis, a morbidity-and-mortality conference — cannot be obtained. The label "privilege" is common but imprecise. In California, Evid. Code § 1157 (current text, AR-085-S01; the 2015 enrolled text, AR-032-S04) is an immunity from discovery for the proceedings and records of qualifying committees — organized medical-staff committees of the listed kinds, and peer review bodies as defined in Bus. & Prof. Code § 805 (AR-023-S07), having responsibility for evaluating and improving the quality of care — together with a bar on compelling an attendee to testify about what transpired at a meeting, subject to the statute's exceptions. The California Supreme Court has described it as an immunity from discovery rather than an evidentiary privilege (Fox v. Kramer, AR-085-C03). It does not protect the underlying facts, the medical record, or documents created in the ordinary course of care or operations, and it does not reach a document merely because it is labelled "quality" or "peer review" or was later handed to a committee (Santa Rosa Memorial Hospital v. Superior Court, AR-085-C02). In a federal-question case, including a § 1983 action with supplemental state claims, federal privilege law governs (Fed. R. Evid. 501, AR-084-F06), and there is no general federal peer-review privilege: the Ninth Circuit has held that federal law recognizes no privilege of peer review in a case involving the death of a prisoner (Agster v. Maricopa County, AR-073-C01). Other protections — attorney-client privilege and work product for counsel-directed investigations, and the federal Patient Safety and Quality Improvement Act where its definitions are met (AR-073-F03) — are separate and have their own requirements (Roadmap 085).

Facts that tend to support it. The case is in state court on state-law claims; the review body is an organized medical-staff committee or a § 805 peer review body — for example, a committee of an entity employing more than twenty-five licentiates of the same class that functions to review the quality of professional care, or the medical staff of a licensed facility; the item sought is a record or proceeding of that committee, or material prepared for and submitted to it; the committee's charter, membership and minutes document its quality-review function.

Facts that tend to weaken it. The body does not qualify — an administrative or operational review, a regulatory death review convened outside a qualifying committee, or an informal clinical conversation called a "conference"; the item was created in the ordinary course (the chart, the audit trail, logs, video, incident reports kept for operations), which remains discoverable from its original source even if a committee later reviewed it; the information sought is the underlying facts or a witness's personal knowledge, which § 1157 never protects; a statutory exception applies (for example, a party who attended the meeting, or the subject of the review in a proceeding the statute names); the case is a federal-question case, where § 1157 does not govern (Agster); the protection concerns discovery, not preservation, so it never excuses the destruction of records (Roadmap 007).

Burden. The party asserting the protection must establish that the review body qualifies and that each item withheld is a record or proceeding of that body, with a particularized showing rather than a label (Santa Rosa; Roadmap 085). A privilege log that identifies the committee and its claimed statutory basis is the ordinary vehicle.

Authority. Roadmaps 066 and 085 (controlling); Roadmaps 032, 073, 084; defense playbook 143; Evid. Code § 1157 (AR-085-S01; AR-032-S04); Bus. & Prof. Code § 805 (AR-023-S07); Fox v. Kramer (AR-085-C03); Santa Rosa Memorial Hospital (AR-085-C02); Fed. R. Evid. 501 (AR-084-F06); Agster v. Maricopa County (AR-073-C01); 42 U.S.C. §§ 299b-21, 299b-22 (AR-073-F03); Bonni (AR-032-C01) on the peer-review setting; Glossary 147 ("Peer-review protection").

Litigation privilege

What it means. California Civil Code § 47(b) can protect qualifying communicative acts connected to judicial or sufficiently official proceedings. The nature and function of the communication, authorized proceeding, litigation connection and claimed tort matter; not every Medical Board report, ordinary personnel disclosure, allegedly retaliatory employment decision or third-party communication is categorically protected. Section 805 reporting immunity has separate conditions. Neither section is current-law authenticated here from California Legislative Counsel.

Facts that tend to support it. The statement was made in a proceeding or in a report the law requires.

Facts that tend to weaken it. The asserted wrong is a separately actionable noncommunicative adverse act, a report was outside the privileged setting, the relationship to an authorized proceeding is missing, or a claim-specific statute alters the privilege analysis. Retaliation labeling by itself does not eliminate all possible privileges; determine whether the remedy targets the communication or an independently actionable decision.

Authority. Civ. Code § 47(b) (not opened); Bus. & Prof. Code § 805 immunities as read (AR-023-S07, with the correction noted in Roadmap 032's verification report); Roadmap 032.

MICRA limits; survival limits

What it means. Not categorical defenses to liability but claim- and filing-date-dependent limits on recovery. Civil Code § 3333.2 establishes distinct escalating MICRA noneconomic-damage limits for qualifying professional-negligence actions, subject to statutory definitions and rules. California Code of Civil Procedure § 377.34(a) generally excludes decedent predeath pain, suffering and disfigurement from survival damages; the temporary § 377.34(b) exception covers actions granted statutory preference before January 1, 2022, or filed on/after January 1, 2022 and before January 1, 2026. A new 2026 filing does not automatically carry the former SB 447 exception. Wrongful-death, federal constitutional, elder/dependent-adult-abuse and survival remedies must be analyzed separately; the cited 2026 § 377.34 text is nonofficial reproduction, not authenticated current Legislative Counsel text.

Facts that bear on them. The action filing date and survival plaintiff's capacity; whether pre-2022 preference applies; whether each defendant and alleged act meet MICRA's professional-negligence definitions; the injury/death category and annually effective limit; whether additional federal or statutory damages regimes exist. A label such as "administrative negligence" does not by itself determine MICRA scope; counsel should compare alleged conduct with statutory elements and governing cases.

Authority. AR-0961-S03, S07; Roadmap 129.1.

Deep companions: Playbooks 134–143#

This page is the crosswalk. Ten deep companions carry each family of defenses at length, with the governing authority, the burdens, the order in which the defenses are usually raised and what the record usually decides. The table points each entry above to its companion. Where no companion is listed, the entry on this page is the fullest treatment.

Using the playbook#

Each defense is an argument, not a verdict. The purpose of listing it is to force the facts that answer it to be gathered before anything is filed: the entity records that answer "wrong defendant"; the dated request that answers "no notice"; the grievance file that answers "PLRA"; the prior incidents that answer "no policy"; the expert review that answers "no breach." Working worksheet references (100–124) remain under namespace hold and must not be represented as reconciled publication links. The pleading models (129–130.1) and the claim model (131) show where each answer is pleaded or presented. The element tables (096.3) show which element each defense attacks.

Nothing in this playbook assesses any person's matter. It is written so that a reader, including a hostile one, sees the strongest form of the opposing argument and the facts that would meet it, stated neutrally.

Primary authorities#

The register entries cited in each entry, drawn from Roadmaps 010–033, 037.1, 090–096.1, Toolkit 125.1, and the R1 register (entries marked R1 pending). Targeted 2026-10-16 rechecking: official Supreme Court Fort Bend and Harrington v. Purdue Pharma opinions; official Ninth Circuit Albino opinion and 2025 Ninth Circuit model jury instruction 9.6; official U.S. House 9 U.S.C. §§ 401–402 and 42 U.S.C. § 1997e(a); CRD right-to-sue/employment guidance; EEOC filing guidance. Section 377.34 was inspected only in nonofficial statutory reproductions, not the current official California code; all other inherited citations retain their original grades and were not independently reopened. No comprehensive subsequent-opinion negative-history citator was run. The 2026-10-09 conformance to the Glossary (Roadmap 147) added reused register entries from Roadmaps 066, 073, 076, 077, 080, 081, 084 and 085, each opened for those pages and not re-opened for this one: Jones v. Bock (AR-080-C04); Woodford v. Ngo (AR-080-C03); Pearson v. Callahan (AR-077-C02); Filarsky v. Delia (AR-077-C03); Jensen v. Lane County (AR-062-C02); Oliver v. Keller (AR-076-C04); Evid. Code § 1157, current text (AR-085-S01); Fox v. Kramer (AR-085-C03); Santa Rosa Memorial Hospital v. Superior Court (AR-085-C02); Fed. R. Evid. 501 (AR-084-F06); Agster v. Maricopa County (AR-073-C01); 42 U.S.C. §§ 299b-21, 299b-22 (AR-073-F03); Bus. & Prof. Code § 805 (AR-023-S07). Not opened for this page: Code Civ. Proc. §§ 474, 2034.210; Civ. Code § 47(b); Gov. Code § 845.6; Lab. Code § 3706; Richards v. CH2M Hill; Toguchi; Jett; Pembaur; City of Canton; Connick; Staub; Reeves (both); Felder; Borello; Dynamex; CACI 500 series; the Ending Forced Arbitration Act.

Related roadmaps#

All employment Roadmaps 010–039; correctional Roadmaps 040–050 (with 040.1 and 048.1) and 051–089, especially 066, 077, 078, 080, 081 and 085; 090, 091, 096, 096.1, 096.2, 096.3; worksheets 100–124; toolkits 125–128.1; models 129–132; deep-companion playbooks 134–143; libraries 144–149, including the Glossary (147) and the provenance and grades page (148); the Navigator (150).

Investigation articles that apply this roadmap#

These articles in the CFMG–Wellpath public-record investigation apply the framework on this page to a specific record. The roadmap explains method; the articles are the record.

• Article 099 — What Would Falsify This Investigation? A Prosecutorial Test of the CFMG-Wellpath Control TheoriesTest the theory against its strongest defense and disconfirming evidence.

What this page cannot do#

It cannot predict whether any defense will succeed, assess any person's case, or substitute for counsel's judgment about which defenses matter on particular facts. It states the arguments and the facts that bear on them, and stops.