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The M'Naghten rule(s) (pronounced, and sometimes spelled, McNaughton) is a legal test defining the defence of insanity that was formulated by the House of Lords in 1843. It is the established standard in UK criminal law.
The question of his mental state posed challenges for both the Crown and the defence. The common law recognised the concept of not guilty by reason of insanity, under the M'Naghten rules, which were based on the issue of whether an accused could not understand the consequences of his actions due to a mental health issue. The Crown would have to ...
The M'Naghten Rules of 1843 were not a codification or definition of insanity but rather the responses of a panel of judges to hypothetical questions posed by Parliament in the wake of Daniel M'Naghten's acquittal for the homicide of Edward Drummond, whom he mistook for British Prime Minister Robert Peel. The rules define the defense as "at the ...
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.
M'Naghten's defence had successfully argued that he was not legally responsible for an act that arose from a delusion; the rules represented a step backwards to the traditional 'knowing right from wrong' test of criminal insanity. Had the rules been applied in M'Naghten's own case, the verdict might have been different. [6]
The insanity defense is a traditional affirmative defense that dates at least back to English common law.The codification of the M'Naghten rules, which have been referenced in one form or another in US law as well as UK law, indicates that someone may be found not guilty of a crime because of a mental condition which prevents them from either controlling their actions or from knowing whether ...
It is a variant of the M'Naghten Rules that addresses the situation in which the defendant knew that what they were going to do was wrong, but had no ability to restrain themself from doing it. The test asks whether they would have done what they did even if a police officer were standing at their elbow, hence its name.
The case of Yates—who had exhibited severe postpartum depression, postpartum psychosis, and schizophrenia leading up to the murders—placed the M'Naghten rules, along with the irresistible impulse test for sanity, under close public scrutiny in the United States.