Fifty years ago, psychedelic drugs were successfully used to treat mental illness; that is, until politicians stepped in and banned them. 

But soon, Australia will lead the world in legalising the use of drugs like MDMA and psilocybin, which is found in magic mushrooms, to treat patients suffering depression and PTSD. 

Today, a leading researcher on the incredible success of the drugs in trials, and how they work. 

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Dr David Nutt, professor of neuropsychopharmacology, Imperial College London