PART I—GENERAL PROVISIONS
CHAPTER 5—GENERAL EXEMPTIONS
Section 27—When an Insane Person is Entitled to Special Verdict.
When a person is accused of crime, the special verdict provided by the Criminal Procedure Code in the case of insanity shall only be applicable—
(a) if he was prevented, by reason of idiocy, imbecility, or any mental derangement or disease affecting the mind, from knowing the nature or consequences of the act in respect of which he is accused ; or
(b) if he did the act in respect of which he is accused under the influence of an insane delusion of such a nature as to render him, in the opinion of the jury or of the Court, an unfit subject for punishment of any kind in respect of such act.
Incapacity - national proceedings
Insanity - national proceedings
Mental disease or defect - national proceedings
EDIT.