99.Under section 8 of the Misuse of Drugs Act 1971, it is an offence for the occupier or a person concerned in the management of premises knowingly to permit controlled drugs to be produced or supplied on the premises. However, knowingly permitting the consumption of a controlled drug has only been an offence in respect of the smoking of cannabis or opium. This very much reflects the drug misuse patterns that prevailed at the time the Act was introduced.