New trials have shown the drug psilocybin to be highly effective in treating depression, with Oakland the latest US city to in effect decriminalise it last week. Some researchers say it could become ‘indefensible’ to ignore the evidence – but how would it work as a reliable treatment? https://www.theguardian.com/science/2019/jun/10/magic-mushrooms-treatment-depression-aztecs-psilocybin-mental-health-medicine