History professor Catherine Carstairs was interviewed on CBC Radio’s The Morning Edition May 2, and the interview was featured in a CBCNews.ca article. Canada first enacted marijuana legislation in 1923, likely in response to a growing number of American states banning the drug — despite little evidence of widespread marijuana use in Canada, Carstairs says. She believes the federal government’s move to legalize marijuana results from Canadians’ familiarity with the drug. Carstairs studies the history of illegal drug use and published Jailed for Possession: Illegal Drug Use, Regulation and Power in Canada, 1920-1961.