In the 50 years since this golden era, scientific progress in psychedelic research has been limited. A backlash against the hippy counterculture ¿ ¿the war on drugs¿ ¿ halted research into psychedelics. In 1971, the UK parliament introduced the Misuse of Drugs Act, classifying psilocybin, LSD and DMT as illegal class A drugs. All further research on psychedelics was banned.