E9: Reefer Madness

At the turn of the 20th century, pharmacies sold medicines containing cannabis regularly. There was no stigma surrounding it. But in the 1930s, a few powerful men stirred up fear about marijuana. The official story: the government prohibited weed in 1937 because it presented a danger to the public in the form of Reefer Madness. ...But is this the truth? Or are there more sinister motives behind this prohibition?