dr. nagarkatti is already beginning clinical trials with leukemia patients. dr. s researchers like nagarkatti are headed in the right direction. >> let's keep this in the corridors of science; let's keep it in the fda. let's deliver what's really medicine-- that is the individual cannabinoids. >> reporter: but this epilepsy sufferer says patients cannot afford to wait. >> i don't know how long it's going to be before they really find out exactly what is working, for me or for others. >> reporter: medical marijuana remains legal in montana, for now. in april, lawmakers passed a full repeal of the law, but governor brian schweitzer vetoed it. >> brown: anna rau's one-hour documentary, "clearing the smoke: the science of cannabis," is airing on many public television stations this summer. you can also watch it online. you'll find a link to montana pbs on our web site, newshour.pbs.org. >> suarez: again, the major developments of the day: an earthquake jarred much of the u.s. east coast. it had a magnitude of 5.8, one of the strongest ever recorded in the region, but