"If they cannot do that, then of course the defendant is to be acquitted."
"did the act or made the omission charged."
"It is obvious that if he was insane at the time of committing the act he could not have had a mens rea" required qualification and was not correct in all circumstances. If a defendant was insane under the second limb of the McNaghten Rules ( McNaghten's Case (1843) 10 CI.&F. 200) so that, although he knew the nature and quality of his act, he did not know that what he was doing was wrong, the defendant could still have the intent to kill or cause grievous bodily harm. This view is supported by Professor Sir John Smith Q.C. in Smith & Hogan, Criminal Law, 9th ed., (1999), p. 206 where he says with reference to the proposition that the defence of insanity is based on the absence of mens rea: "