Mark Kleiman teaches public policy at the University of California, Los Angeles; he has written influentially about drug policy for a couple of decades.

马克·克雷曼在加州大学洛杉矶分校执教公共政策；几十年来，他已就毒品政策发表了多部有影响力的著作。

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Mark Kleiman, a professor who studies crime policy at the University of California, Los Angeles, said that by enforcing laws, authorities in New York are keeping people off the streets who are more likely to be committing serious crime.

WSJ: Experts back NYC's link of gun laws, lower crime