Drugs and Consciousness

Does LSD open the doors of perception or just mess with your head? Leo Butler tells Matthew Sweet about writing a play inspired by taking part in the world's first LSD medical trials since the 1960s. Philosophers Peg O'Connor and Barry Smith lock horns with neuropsychopharmacologist David Nutt over whether drug-induced hallucinations allow access to a deeper reality. Producer: Torquil MacLeod