KQED // Petrie-Flom Center Obtaining informed consent for psychedelics poses special challenges for practitioners, featuring Petrie-Flom’s Mason MarksCalifornia has an opportunity to massively expand places where people can use psychedelic drugs under supervision, according to a new bill proposing to legalize substances in approved service centers, including psilocybin, MDMA and mescaline for therapeutic use. By Sydney Johnson,…