麻豆社

The decision by the Crown Prosecution Service to offer no evidence against a man accused of intending to supply nitrous oxide at a music festival raises questions as to whether the Government's Psychoactive Substances Act brought in last year to ban so-called legal highs is effective.

Kirstie Douse is Head of legal services for Release. She says: "This law is completely unworkable."

Mike Trace is the Former Deputy Drugs Tsar and he tells John Humphrys that there are difficult definition issues: "For drugs to be included under this act the law has prove that they have a psychoactive effective on humans...but there is no research to prove that."

(Image: Cannabis leave; Credit: Getty Images)