He touches on the history of governments banning various drugs through junk science and propaganda (mostly from the US which influences the rest of the world). The scheduling system for drugs is a joke.
Also interesting that the inventor of AA credited LSD for his ability to quit drinking.
Edit: David Nutt authored this study in the NEJM https://www.nejm.org/doi/full/10.1056/nejmoa2032994 which pitted psilocybin against lexapro for the treatment of depression and it showed the same effectiveness (more nuanced than that but you'll have to read or listen). Peter talked about how he is very familiar with Lexapro and it's side effects (libido, a blunting effect on life) in his patients and remarked that what was most exciting about that study is that it showed it could be as effective as Lexapro with less side effects.