. >> heroin, cocaine lsd k mzna ecstasy, all of these drugs are much easier to study than marijuana. >> brad best of your knowledge working to legitimize marijuana. >> studying as i studying as piern or lsd that'saspirin or lsd. >> independent researchers require an open ended health review unique to pot which can stall research forever. >> we have been looking for a study on marijuana particularly ptsd, for years now. >> the legal purchaser is the federal government, only authorized the study of potential harm not benefit. >> it's a choke point that prevents researchers from getting marijuana simply by withholding marijuana. researchers are not able to conduct the research. >> how do you account for this incredible discrepancies in how marijuana is treated versus how cocaine is treated? >> you have to look back at the rift history of marijuana which has been prohibited since the 1930s, our federal government has seen marijuana as the linchpin of the war on drugs. >> the stigma of pot kept constance finley from using it for years. >> maybe at a party, six to eight times a year, you do