Part II
Criminal Responsibility
Act of a person incapable of judgment by reason of insanity or intoxication etc.
10. A person shall not be deemed to have committed an offence who at the time of committing the act does not appreciate the nature or consequences of his acts, or is unable to control them by reason of :-
(a) Permanent, or temporary insanity, or mental infirmity; or
(b) Sleep, or unconsciousness, or
(c) taking intoxicant substances or drugs as a result of coercion, or necessity, or without knowing it to be so, but where the intoxicant substance, or drug is taken voluntarily , knowingly, and without necessity he shall be responsible for the offence as if he had committed it without being intoxicated or drugged.
Incapacity - national proceedings
EDIT.