
Criminal Law Deep Dive: Excuse Defenses, Capacity, and Modification of Culpability — Insanity, Diminished Capacity, Intoxication, Infancy, Duress, Mistake of Fact, Mistake of Law, and Entrapment
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🎧 EPISODE SUMMARY 🎧
Excuse defenses reduce liability when an actor lacks moral blameworthiness, capacity, or mens rea. Third parties assisting an excused actor remain guilty as accomplices, and victims retain self-defense rights.
Incompetency evaluates state at trial. Insanity evaluates state at crime due to mental disease or defect under four tests:
1. M'Naghten (Cognitive): Did not know the nature/quality or wrongfulness of the act.
2. Irresistible Impulse (Volitional): Lacked self-control/free choice to conform conduct.
3. Durham (Causal): Crime was the product of mental disease (but for cause).
4. MPC (Hybrid): Lacked substantial capacity to appreciate wrongfulness or conform conduct.
Diminished Capacity negates mens rea—limited in most states to specific intent crimes; allowed under MPC for any subjective mental state.
Voluntary Intoxication is a defense ONLY to specific intent crimes (and MPC purpose/knowledge). It is NEVER a defense to malice, general intent, strict liability, or MPC recklessness/negligence.
Involuntary Intoxication is treated like insanity and is a complete defense to ALL crimes if the standard is met.
Infancy: Conclusive incapacity under 7, rebuttable presumption 7 to 14, and adult capacity at 14+.
Duress requires reasonable belief of imminent death or serious injury. At common law, duress is NEVER a defense to intentional homicide (but IS to felony murder). The MPC uses a person of reasonable firmness standard and does NOT exclude homicide.
Mistake of Fact operates by negating mens rea:
Specific Intent: ANY honest mistake is a defense.
General Intent/Malice: Must be honest AND reasonable.
Strict Liability: NEVER a defense.
MPC: Defense if it negates the required mental state.
Mistake of Law is rarely a defense (even on lawyer’s advice), except for: (1) collateral civil law negating specific intent; (2) reliance on official interpretation; (3) Lambert notice exception; or (4) "willful" statutory violations.
Entrapment requires government agent inducement. Under the majority subjective test, it fails if defendant was predisposed. Under the minority/MPC objective test, predisposition is irrelevant and evaluates risk to a hypothetical law-abiding person.
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