Lots of them guide trials that contain magic mushrooms. Look at searching into that by calling biology / neuroscience / psychology departments at unique universities. Magic mushrooms on their own aren’t banned inside the US — it’s their active ingredients, psilocybin and psilocin. Magic mushrooms are viewed as a “container” https://psilocybinshroombars.co.uk/product/black-label-thc-syrup-1000mg/