I don't think it ever mentions the Madrid of Virginia studies. In fact this is an extraordinary movie imo. One that I feel every voting adult should see and think dearly about.
Oh, well the first documented study on cannabis effects against cancer with positive results was in 1974 done at the Vergina Medical College. They had rats with brain tumors and directly injected THC into the tumors. The tumors shrunk and in some cases had completely disappeared. However before the study was finished the US government shut down the study and attempted to destroy all its data.
Hardly a surprise if you ask me on any of it lol.