LSD, magic mushrooms, mescaline, peyote - just some of the most well known psychedelic drugs. Most of them are illegal around the world. Research into psychedelic medicine was virtually shut down in the West because psychedelics were considered mind-altering substances open to abuse. This perception is changing. There is a growing body of evidence that some psychedelic drugs can be used to treat a variety of medical conditions. There have been clinical trials of psilocybin - the active ingredient in magic mushrooms - for treatment-resistant depression. Just one dose was found to help people with life-threatening cancer face death. James Coomarasamy and a panel of expert guests discuss the evidence that psychedelics have transformative and beneficial properties. Are most authorities right to continue to ban them or should they be considered for wider use - and if so, under what conditions?