Criminal Law Deep Dive: Justification Defenses — Self-Defense, Defense of Others, Defense of Habitation and Property, Necessity, Law Enforcement Authority, and Consent
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🎧 EPISODE SUMMARY 🎧
Justification defenses absolve criminal liability when conduct is socially permissible or avoids greater evil. Third parties assisting a justified actor incur no accomplice liability. Defensive justifications distinguish non-deadly force from deadly force (merely threatening/brandishing a weapon is non-deadly).
Self-Defense permits non-deadly force upon an honest and reasonable belief that it is necessary to protect against imminent unlawful force. Deadly force requires a reasonable belief of necessity to prevent imminent death, serious bodily injury, or a forcible felony.
There is never a duty to retreat for non-deadly force. For deadly force, the majority rule ("Stand Your Ground") imposes no duty to retreat, while the minority rule and the MPC require retreat only if the actor knows he can retreat with complete safety (subject to the Castle Doctrine in one's dwelling or MPC place of work).
An initial aggressor forfeits self-defense unless using non-deadly force and the victim suddenly escalates to deadly force, or he withdraws in good faith and communicates his withdrawal.
Perfect self-defense acquits completely. Imperfect self-defense (honest but unreasonable belief) mitigates murder to voluntary manslaughter, while the MPC graded culpability rule convicts based on reckless or negligent state of mind.
Defense of Others applies under the modern majority and MPC "reasonable appearance" rule if it reasonably appears defense was justified (rejecting the strict alter ego rule).
Defense of Property and Habitation: deadly force may NEVER be used solely to defend property (and deadly mechanical spring guns are barred). Reasonable non-deadly force defends property or chattels only in immediate fresh pursuit. Deadly force in defense of the dwelling requires reasonable belief of an imminent personal assault or forcible felony inside.
Necessity (Choice of Evils) avoids an objectively greater imminent harm. At common law, it is never a defense to intentional homicide, whereas the MPC allows it for a net saving of human lives.
Law Enforcement Authority: A police officer uses deadly force only if there is probable cause to believe the suspect poses a significant threat of death or serious physical injury. A private citizen acts at peril at common law (must in fact be guilty), and under the MPC uses deadly force only when summoned to assist a peace officer.
Consent is valid only if non-consent is an element, harm is minor bodily injury, or risk falls under lawful sports or medical treatment without fraud in the factum.
Following this sequence ensures issue-spotting accuracy across common law and MPC standards.
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