Part II
Criminal Responsibility
Act of a person incapable of judgment by reason of insanity or intoxication etc.
10. (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.
Intoxication - national proceedings
EDIT.