The definition of M'Naghten rule varies from state to state, because it is not a legal term or a psychological term. it means that an individual may not understand the difference between right and wrong.
According to the M'Naghten Test or M'Naghten Rule, an individual may qualify as insane if, at the time of the alleged crime, they were suffering from a mental condition and were incapable of understanding the character or nature of the conduct they were committing.
If a criminal is unable of understanding that their actions are wrong ethically or legally because of a mental illness or mental defect, they should be declared not guilty by reason of insanity.
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