M Naghten Case Analysis

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What is it?
A person accused of a crime can acknowledge that they committed the crime, but argue that they are not responsible for it because of their mental illness, by pleading "not guilty by reason of insanity." However there are two types of defenses, "reason of insanity" and "diminished capacity." Reason of insanity, is the equivalent of pleading "not guilty," while diminished capacity is merely pleading to a lesser crime. (Insanity1) The insanity defense came to surface by society coming to a compromise on the part of society and law. On the one hand, society believes that criminals should be punished for their crimes; on the other hand, society believes that people who are ill should receive treatment for their illness. The insanity …show more content…

Englishman Daniel M'Naghten shot and killed the secretary of the British Prime Minister, believing that the Prime Minister was conspiring against him (Chambliss, 2011). The court acquitted M'Naghten "by reason of insanity," and he was placed in a mental institution for the rest of his life. However, the case caused a public uproar, and Queen Victoria ordered the court to develop a stricter test for insanity.
The M’Naghten rule “involves a strictly binary decision: either the defendant cognitive capacity is totally impaired or it is not, and does not recognize that sanity may be a matter of degree” (Chambliss, 2011, Pg. 135). A person who can distinguish right and wrong, yet unable to control his or her behavior, is unlikely to be found insane under Mcnaghten. The M'Naghten rule became the standard for insanity in the United States and the United Kingdom, and is still the standard for insanity in almost half of the states. …show more content…

This rule says that a defendant is not responsible for criminal conduct where (s)he, as a result of mental disease or defect, did not possess "substantial capacity either to appreciate the criminality of his conduct or to conform his conduct to the requirements of the law." (insanity2) The key term is appreciate, which made the proof of insanity easier for defendants, leads psychiatrists to disagree. Obviously, this standard is very vague. It leaves a number of factors up to the jury to determine, given the facts of a case and the testimony of experts. About half the states have adopted the Model Penal Code rule for

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