plea of insanity
Noun: * (Criminal Law) A formal legal claim by a defendant asserting they were not responsible for a crime due to being mentally incompetent or legally insane at the time the crime was committed. This plea does not deny the physical act but argues the defendant lacked the mental capacity to understand its wrongfulness or to conform their conduct to the law.
This term is used exclusively in formal legal contexts, specifically during criminal trials. * It is entered as a plea (a formal statement of "guilty" or "not guilty") at arraignment or during proceedings. * It initiates a specific legal process where the burden of proof often shifts to the defense to demonstrate the defendant's insanity at the time of the offense. * A successful plea of insanity typically results in a verdict of "not guilty by reason of insanity," which leads to commitment to a mental health facility rather than imprisonment.
- The defense attorney entered a plea of insanity on behalf of his client.
- The court must evaluate the psychiatric evidence before accepting a plea of insanity.
- In many jurisdictions, a successful plea of insanity requires proving the defendant could not distinguish right from wrong.
- "To enter a plea of insanity": The formal act of submitting this claim to the court.
- "To stand on a plea of insanity": To maintain and argue for this plea throughout the trial.
- The criteria for a successful plea of insanity vary by jurisdiction, with tests like the M'Naghten Rules ("right from wrong" test) or the Model Penal Code's "substantial capacity" test being common standards.
- Insanity defense (n): The broader legal strategy of which the plea of insanity is the formal component.
- Not guilty by reason of insanity (NGRI) (n): The formal verdict resulting from a successful plea of insanity.
- Guilty but mentally ill (GBMI) (n): An alternative verdict in some jurisdictions, distinct from a successful plea of insanity, where the defendant is found criminally responsible but requires psychiatric treatment.
- Insanity defense (This is often used interchangeably in general discussion, though technically the defense is the strategy, and the plea is the formal claim.)
- Competency to stand trial: A separate legal issue concerning a defendant's mental state the trial proceedings, not at the time of the crime.
- Diminished capacity: A related but often lesser defense arguing that mental defect prevented the formation of a specific intent required for the crime.
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(criminal law) a plea in which the defendant claims innocence due to mental incompetence at the time
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