A BBC News item this morning concerning ‘Spice’, states that the “Effects of the synthetic drug can be extreme, causing hallucinations, psychosis, muscle weakness and paranoia”.  What is actually being referred to are synthetic cannabinoids of which there are a good many, and not a single substance: see  “Perspectives on Drugs: Synthetic cannabinoids in Europe” published by the EMCDDA.  Many synthetic cannabinoids have been controlled under the Misuse of Drugs Act 1971 (UK) at various times, and those which are not controlled might be caught by the Psychoactive Substances Act 2016 (UK).  Hopefully research is being conducted to establish prevalence of use, by whom, the supply routes, and the effectiveness of current legislation.