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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.
Federal law provides for the commitment of those found not guilty only by reason of insanity. Once such a verdict is handed down, the defendant has the burden of proof of showing that his release would not create a substantial risk of bodily injury to another person or serious damage of property of another due to a present mental disease or ...
Insanity is no longer considered a medical diagnosis but is a legal term in the United States, stemming from its original use in common law. [10] The disorders formerly encompassed by the term covered a wide range of mental disorders now diagnosed as bipolar disorder , organic brain syndromes , schizophrenia , and other psychotic disorders.
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 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]
Insanity or mental disorder (Australia and Canada), may negate the intent of any crime, although it pertains only to those crimes having an intent element. A variety of rules have been advanced to define what, precisely, constitutes criminal insanity .
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.
Voluntary (and often involuntary) intoxication cannot cause legal automatism. In many jurisdictions, there is a distinction made between "sane automatism" and "insane automatism". Where the involuntariness is caused by a mental illness, or "disease of the mind", as per the M'Naghten rules , it will be regarded as "insane automatism" and will ...