Insanity Defense
/ɪnˈsænɪti dɪˌfɛns/
Definitions
- (n.) A legal defense asserting that a defendant was legally insane at the time of committing an offense, thus lacking the mental capacity to be held criminally responsible.
The defendant pleaded the insanity defense, claiming he could not understand the wrongfulness of his actions.
- (n.) A defense invoking mental disorder under specific rules (e.g., M'Naghten Rule) to negate criminal intent or culpability.
Under the M'Naghten Rule, the insanity defense requires proof the defendant did not know right from wrong.
Forms
- insanity defenses
Related terms
See also
Commentary
The insanity defense varies by jurisdiction and often requires expert psychiatric testimony; care should be taken to specify the applicable standard when drafting or litigating.
This glossary is for general informational and educational purposes only. Definitions are jurisdiction-agnostic but reflect terminology and concepts primarily drawn from English and American legal traditions. Nothing herein constitutes legal advice or creates a lawyer-client relationship. Users should consult qualified counsel for advice on specific matters or jurisdictions.