The Insanity Plea and Mental Illness

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The insanity plea, or the “irresistible impulse” defense, described by Martin (1998) as “a plea that defendants are not guilty because they lacked the mental capacity to realize that they committed a wrong or appreciate why it was wrong.” Remains a very controversial within the judicial system, with many believing that the defense attempts to fake a purportedly guilty man’s insanity, more often to make sure the defendant gets a less harsh conviction or the possibility of an acquittal. While the plea is truly helpful to many who suffer from mental illness, many who do not suffer from illness try to use it as a get-out of-jail-free card.
The insanity plea’s first successful use occurred in England by a man named Daniel M’Naghten. M’Naghten believed falsely that the Prime Minister of England established a plot against him, M’Naghten decided to take action, attempted to ambush the Prime Minister, and unfortunately shot and killed his press secretary in the confusion. Established psychologists in England testified to the mental instability of M’Naghten. The jury eventually reached a verdict of not guilty by reason of insanity and was held in a mental institution for the remainder of his life. This ruling was then brought to The House of Lords, and 15 judges met to determine the judicial standard of the insanity plea. They established a test under the so called “M’Naghten Rule”, which Douglas states:
“Under the M'Naghten test of insanity, also called the "right-wrong test," a person was not criminally responsible if at the time of the crime, he did not know the nature of the act or that it was wrong. The jury was required to answer two questions: (1) did the defendant know what he was doing when he committed the crime? Or (2) did the...

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...rieved November 25, 2013, from http://www.repository.law.indiana.edu/cgi/viewcontent.cgi?article=1494&context=ilj
Lally, S. (1997, November 23). Drawing a Clear Line Between Criminals and the Criminally Insane. The Washington Post. Retrieved November 25, 2013, from http://www.washingtonpost.com/wp-srv/local/longterm/aron/expert1123.htm
Scott, S. (n.d.). Are They Insane?. What Makes Serial Killers Tick?. Retrieved November 25, 2013, from http://www.trutv.com/library/crime/serial_killers/notorious/tick/insane_8.html
Linder, D., Collins, K., Hinkebein, G., & Schorgl , S. (n.d.). Retrieved from http://law2.umkc.edu/faculty/projects/ftrials/hinckley/hinckleyinsanity.html
Martin, J. P. (n.d.). Retrieved from http://www.washingtonpost.com/wp-srv/local/longterm/aron/qa227.html
Douglas, L. (n.d.). Retrieved from http://law2.umkc.edu/faculty/projects/ftrials/hinckley/EVOL.HTM

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