STUDIES:
8/
“The targeting of [marijuana] enforcement efforts toward blacks and Hispanics is dramatically out of proportion to national statistics that suggest comparable usage rates across racial groups."

Pot as Pretext: Marijuana, Race, and the New Disorder in New York City Street Policing
Journal of Empirical Legal Studies
Vol. 7 Issue4, pp. 591–633,
2010
Comment on this study on its Twitter thread.