Non-Fatal Offences Against the Person Act 1997
12.— (1) A person shall be guilty of an offence if, knowing that the other does not consent to what is being done, he or she intentionally or recklessly administers to or causes to be taken by another a substance which he or she knows to be capable of interfering substantially with the other's bodily functions.
(2) For the purpose of this section a substance capable of inducing unconsciousness or sleep is capable of interfering substantially with bodily functions.
(3) A person guilty of an offence under this section shall be liable—
( a) on summary conviction to a fine not exceeding £1,500 or to imprisonment for a term not exceeding 12 months or to both, or
( b) on conviction on indictment to a fine or to imprisonment for a term not exceeding 3 years or to both.