1) The passage discusses the history of marijuana criminalization and decriminalization in relation to labeling theory in criminology.
2) Labeling theory suggests that behaviors become criminal due to how society labels them, and that once labeled (e.g. as a "pothead") it shapes one's life and social treatment.
3) The document traces how marijuana became criminalized in the 1930s due to xenophobic attitudes towards Mexican immigrants, and how the head of the narcotics bureau campaigned to shape public opinion by exaggerating the drug's effects.