Grass (1999)

This film explores the history of the American government's official policy on marijuana in the 20th century. Rising with nativist xenophobia with Mexican immigration and their taste for smoking marijuana, we see the establishment of a wrong headed federal drug policy as a crime issue as oppposed to a public health approach. Fuelled by prejudice, hysterical propaganda and political opportunism undeterred by voices of reason on the subject, we follow the story of a costly and futile crusade against a substance with questionable ill effects that has damaged basic civil liberites. (imdb)