The M Naghten Rule: Criminal Insanity

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The M’Naghten Rule
The M’Naghten rule is a test for criminal insanity and states that, if at the time of the offence, the accused had a disease of the mind and that he was unable to know that his act was wrong. The application of this test determines whether the accused was sane at the time of the crime’s commission. Subsequently, by this rule, a criminal is not guilty by reason of insanity if the accused was so insane that they did not know the nature of his actions or, if he knew the nature of his action but was so insane did not know what he was doing was wrong.
The M’Naghten rule originates from England in 1843, named for the M’Naghten case. Daniel M’Naghten shot and killed the secretary of the British Prime Minister, mistaking the secretary for the Prime Minister in the belief that the Prime Minister was conspiring against him. During M’Naghten’s trial, nine witnesses testified to the fact that he was insane and he was acquitted by the jury finding him “not guilty by reason of insanity”.
However, Queen Victoria was not pleased with this outcome, requesting that the House of Lords review the verdict with a panel of judges. The jury verdict was reversed and a new formulation emerged from their review stating that “a defendant …show more content…

In order for the defence of criminal insanity to be considered, the severity of the crime but have been one that expressed the standard to be defined as indictable. This is due to the fact that a summary offence would not qualify for a trial before a jury and that absolving one of a summary offence such as driving under the influence of alcohol would be unsuitable for the asperity of the crime. As R v Porter was a murder case, therefore indictable, it would be suitable for the criminal insanity defence to be

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