The question to be determined is the prisoner had or had not the use of his understanding, so as to know that he was doing a wrong or wicked act. If the jurors should be of the opinion that the prisoner was not sensible, at the time he committed it, that he was violating the laws both of God and man, then he would be entitled to a verdict in his favour of insanity." (Lord Chief Justice N Conyngham Tindal at trial of Daniel M'Naghten, 1843)
, whether at the time the act was committed,