PHILADELPHIA — Jess Jones, a licensed clinical social worker, treats a number of patients with ketamine-assisted therapy — where clients take ketamine, prescribed by a psychiatrist, in a series of sessions to treat severe depression or other serious mental health issues. Interest in psychedelic-assisted therapies such as these is growing in the United States, and an emerging body of research suggests that ketamine can successfully treat depression that's resistant to more traditional methods of treatment. Some states are moving toward legalizing psychedelics: Colorado and Oregon have decrimina...