"2nd. What are the proper questions to be submitted to the jury, when a person alleged to be afflicted with insane delusion respecting one or more particular subjects or persons, is charged with the commission of a crime (murder, for example), and insanity is set up as a defence? 3rd. In what terms ought the question to be left to the jury, as to the prisoner's state of mind at the time when the act was committed? 4th. If a person under an insane delusion as to existing facts, commits an offence in consequence thereof, is he thereby excused?"
"… The jurors ought to be told in all cases that every man is to be presumed to be sane, and to possess a sufficient degree of reason to be responsible for his crimes, until the contrary be proved to their satisfaction; and that to establish a defence on the ground of insanity, it must be clearly proved that, at the time of the committing of the act, the party accused was labouring under such a defect of reason, from disease of the mind, as not to know the nature and quality of the act he was doing; or, if he did know it, that he did not know he was doing what was wrong. The mode of putting the latter part of the question to the jury on these occasions has generally been, whether the accused at the time of doing the act knew the difference between right and wrong: which mode, though rarely, if ever, leading to any mistake with the jury, is not, as we conceive, so accurate when put generally and in the abstract, as when put with reference to the party's knowledge of right and wrong in respect to the very act with which he is charged. If the question were to be put as to the knowledge of the accused solely and exclusively with reference to the law of the land, it might tend to confound the jury, by inducing them to believe that an actual knowledge of the law of the land was essential in order to lead to a conviction; whereas the law is administered upon the principle that every one must be taken conclusively to know it, without proof that he does know it. If the accused was conscious that the act was one which he ought not to do, and if that act was at the same time contrary to the law of the land, he is punishable ; and the usual course therefore has been to leave the question to the jury, whether the party accused had a sufficient degree of reason to know that he was doing an act that was wrong : and this course we think is correct, accompanied with such observations and explanations as the circumstances of each particular case may require."
"… the answer must of course depend on the nature of the delusion: but, making the same assumption as we did before, namely that he labours under such partial delusion only, and is not in other respects insane, we think he must be considered in the same situation as to responsibility as if the facts with respect to which the delusion exists were real. For example,if under the influence of his delusion he supposes another man to be in the act of attempting to take away his life, and he kills that man, as he supposes, in self-defence, he would be exempt from punishment. If his delusion was that the deceased had inflicted a serious injury to his character and fortune, and he killed him in revenge for such supposed injury, he would be liable to punishment."
"Areas of agreement. The defendant was seriously mentally ill at the time of the incident The defendant was psychotic and deluded at the time of the incident and this impaired his capacity for rational thought At the time of the incident the defendant was suffering from a disease of the mind that led to a defect of reason At the time of the incident the defendant knew the nature and quality of his actions Areas of disagreement The experts disagree to what extent his disordered mental state impaired his ability to know that what he was doing was wrong [Dr Amos and Dr Sandford] think that although he may have acted in response to delusional beliefs, his actions and his later explanation do not suggest that he thought he was acting lawfully (on the balance of probability he did know that what he was doing was wrong). [Dr O'Shea and Dr Singh] think that his mental state was so disturbed that at the time of the offences he was unable to form a rational understanding of right and wrong."
"The Defence of Insanity 8. The defendant has raised the defence of insanity; insanity being a legal term used to describe the effect of a medical condition on the functioning of the mind. Insanity does not have to be permanent or incurable: it may be temporary and curable. 9. In law, a person is presumed to be sane and reasonable enough to be responsible for their actions. But if a person proves that it is more likely than not that, when they did a particular act, because they were suffering from a disease of the mind either they did not know what they were doing or they did not know that what they were doing was wrong, by the standards of reasonable ordinary people , the defendant is to be found "not guilty by reason of insanity". "
"Is it more likely than not that the defendant did not know that his actions on the night of the 26-27 th September 2018 were against the law? If "yes", you will find the defendant not guilty on counts 1, 2 and 3 by reason of insanity … your task will end there if "no", go to question 2"
"It is for me to give you directions as to the meaning of the expression "did not know that what he was doing was wrong", in the context of this case, "wrong" means i) that at the time he knew he was doing something he should not do; and ii) he chose nonetheless to do it If on the balance of probabilities you conclude that his delusion was such that he believed he had no choice, then the defence of insanity is made out."