Could psychedelic drugs help in the treatment of mental health conditions? We look at pioneering research into psilocybin, the active ingredient in so-called magic mushrooms. We visit a clinic in Oregon, the only state in America where the use of psilocybin in therapeutic sessions is legal and hear from one patient who says it's the only treatment she's ever had that makes a difference to her depression. And we hear about some of the widespread concerns that widening access to such drugs could have.

Presenter: Myra Anubi Reporter: Ben Wyatt Series Producer: Jon Bithrey Editor: Sam Bonham Sound Mix: Annie Gardiner