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The House of Lords delivered the following exposition of the rules: . the jurors ought to be told in all cases that every man is to be presumed to be sane, and to possess a sufficient degree of reason to be responsible for his crimes, until the contrary be proved to their satisfaction; and that to establish a defence on the ground of insanity, it must be clearly proved that, at the time of the ...
The insanity defense, also known as the mental disorder defense, is an affirmative defense by excuse in a criminal case, arguing that the defendant is not responsible for their actions due to a psychiatric disease at the time of the criminal act.
Per Federal Rule of Criminal Procedure 12.2, a defendant intending to pursue an insanity defense must timely notify an attorney for the government in writing. The government then has a right to have the court order a psychiatric or psychological examination.
"Irresistible impulse" can be pleaded only under the defense of diminished responsibility, not under the defense of insanity. Thus it operates only as a partial defence to murder, reducing the charge to manslaughter, and giving the judge discretion as to length of sentence and whether committal would be more appropriate than incarceration.
The ALI rule, or American Law Institute Model Penal Code rule, is a recommended rule for instructing juries how to find a defendant in a criminal trial is not guilty by reason of insanity.
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Durham v. United States, 214 F.2d 862 (D.C. Cir. 1954), [1] is a criminal case articulating what became known as the Durham rule for juries to find a defendant is not guilty by reason of insanity: "an accused is not criminally responsible if his unlawful act was the product of mental disease or mental defect."
The idea of insanity in English law dates from 1324, when the Statute de Praerogativa Regis allowed the King to take the lands of "idiots and lunatics." The early law used various words, including "idiot", "fool" and "sot" to refer to those who had been insane since birth, [2] and "lunatic" for those who had later become insane, or were insane with some lucid intervals. [3]