sue sisley would need more than just stories. she needed scientific proof that marijuana eases ptsd. she wanted to study this plant like you would any other medication. >> we had a duty as medical professionals to demand that this plant be allowed to go through the proper drug development process of the fda. >> so dr. sue sisley, the skeptic, and rick done doblin, the believer, started their crusade in 2009. >> that's what we're hearing from the vets, that they want these two different kinds. >> their goal -- to investigate this simple but profoundly important question. could marijuana help save veterans like shawn kiernan? >> the veterans are saying they want an activating strain for the morning and they want a sedating strain at night. >> problem is they first applied to the federal government for approval in 2010 and were rejected. then again in 2012, but were delayed for years by government bureaucracy. >> that was extremely demoralizing to me. it was just frustrating. >> i can understand some concerns about inefficiency and

sue sisley and -- >> mike is traveling around the country with dr.annabis regulation. it's been a month now since he petitioned the nfl for a therapeutic use exemption for cannabis. >> this is my medicine. it's not like -- it's not a game or anything. >> mike's case is such a perfect example of why cannabis needs to be made available because he's really not a candidate for opioids. >> this crowd seems receptive to that message. but that's not the case 500 miles away in the nation's capital. >> the use of marijuana is detrimental. >> marijuana is not a healthy substance. >> if i were sick i wouldn't suggest you take marijuana to cure yourself. >> attorney general jeff sessions, who declined to be interviewed for this documentary, has made it crystal clear, he sees no good to come out of marijuana. including cannabis's role in the opioid crisis. >> i'm astonished to hear people suggest we can solve our heroin, crisis, have you heard this, by having more marijuana. how stupid is that? >> this bills become so addictive. the dea said a huge percentage of