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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.
A defense of justification is the product of society's determination that the actual existence of certain circumstances will operate to make proper and legal what otherwise would be criminal conduct. A defense of excuse, contrarily, does not make legal and proper conduct which ordinarily would result in criminal liability; instead, it openly ...
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 defense is to be contrasted with insanity which is a complete but affirmative defense. In most jurisdictions a defendant would be acquitted on the grounds of insanity if the defendant established to the satisfaction of the jury that he suffered from such a mental disease or defect that he was unable to appreciate the consequences of his ...
In contemporary usage, the term insanity is an informal, un-scientific term denoting "mental instability"; thus, the term insanity defense is the legal definition of mental instability. In medicine, the general term psychosis is used to include the presence of delusions and/or hallucinations in a patient; [ 1 ] and psychiatric illness is ...
Because the defense had the burden to prove Scolman was not guilty by reason of mental disease or defect — also known an NGI plea — the defense gave their opening statement before the prosecution.
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]
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.