Can the convict use insanity as a defence for committing a murder?
The jury reached a verdict of not guilty by reason of insanity. Also, itheld that “every man is presumed sane and to possess a sufficient degree of reason to be responsible for his crimes. Therefore, in order to establish an insanity defense, it must be clearly proven that at the time of the act, the accused was under such a defect of reason from disease of the mind that he did not know the nature and quality of the act he was committing; or if he did know, he did not know what he was doing was wrong.
The M’Naghten Rule has generally been presented to the jury as a standard in determining whether the accused at the time of doing the act knew the difference between right and wrong. This standard should be used in conjunction with observations made of the defendant under the relevant circumstances on a case-by-case basis. "
-Para 3 (R v M’Naghten)