Suicide is a tragic epidemic among US military veterans, but a new documentary charts how psychedelic drugs offer a glimmer of hope to elite soldiers battling post-traumatic stress disorder and depression.

"We're not scientists, we don't know exactly what's happening," said Jon Shenk, who co-directed "In Waves and War" with his wife Bonni Cohen.

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.