Insanity Defence Essay

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WITH THE AID OF STATUTORY AND RECENT CASES DISCUSS THE DISTINCTION BETWEEN ENGLISH AND NIGERIAN LAW ON INSANTY. Insanity is a defence to criminal charges based on the idea that defendant was unable to understand that what he was doing was wrong. The defence comes in two forms, where the defendant claims he was insane at the time of trial or insane at the time of crime. In the first situation, the test is whether or not the defendant can differentiate between “guilty” and “not guilty” verdicts instruct counsel and recognize the charges he is facing. In the second situation, the defendant must show that he was either suffering from a disease which damaged the function of the mind and led to a defect of reason that prevented him from understanding what he was doing, or that he could not tell that what he was doing was wrong. The English law on insanity was based firmly on the Mag naughtan case; there the judges decided that “everyman is presumed to be sane, and to possess a sufficient degree of reason to be responsible for his crime, 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 committing of the act, the party accused was labouring under such a defect of reason from diseases of the mind, as not to know the nature and quality of the act he was doing; or if he did know, that he did not know what he was doing was wrong. This rule remains the principal method of deciding insanity in English law. In English, “disease of the mind” is not a medical term; it instead means that the defendant must show he was suffering from a disease which affected the functioning of the mind, which does not necessary have to be a disease of the brain. This was confirmed in Rv Kemp (1959) 1QB 399 where the defendant’s arterioscirosis led to him assaulting his
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