An Act to prevent the misuse of dangerous or otherwise harmful psychoactive substances; to provide for offences relating to the sale, importation, exportation or advertisement of those substances; to provide for offences relating to the sale and advertisement of certain objects for use in the cultivation of certain plants in contravention of the Misuse Of Drugs Act 1977; to provide for powers of the Garda Síochána in relation to the investigation of those offences; to make provision in relation to the issuing of prohibition notices by certain members of the Garda Síochána to certain persons in relation to activities that are prohibited; to provide for the making by the district court of prohibition orders and closure orders in certain circumstances; to amend the Customs And Excise (Miscellanous Provisions) Act 1988; and to provide for related matters.