Section 10(1)(a) in The Narcotic Drugs And Psychotropic Substances Act, 1985
(a)permit and regulate--(i)the possession, transport, import inter-State, export inter-State, warehousing, sale, purchase, consumption and use of poppy straw except poppy straw produced from plants from which no juice has been extracted through lancing;(ii)the possession, transport, import inter-State, export inter-State, sale, purchase, consumption and use of opium;(iii)the cultivation of any cannabis plant, production, manufacture, possession, transport, import inter-State, export inter-State, sale, purchase consumption or use of cannabis (excluding charas);(iv)the manufacture of medicinal opium or any preparation containing any manufactured drug from materials which the maker is lawfully entitled to possess;(v)the possession, transport, purchase, sale, import inter-State, export inter-State, use or consumption of manufactured drugs (other than prepared opium and essential narcotic drugs) and of coca leaf and any preparation containing any manufactured drug;(vi)the manufacture and possession of prepared opium from opium lawfully possessed by an addict registered with the State Government on medical advice for his personal consumption: