Franklin Zimring's 2017 book, When Police Kill, starts with an alarming statistic: Roughly 1,000 Americans die each year at the hands of police. Zimring, criminologist and law professor at the University of California at Berkeley, talks about his book with EconTalk host Russ Roberts. Zimring argues that better policing practices can reduce the number of citizens killed by the police. He also discusses the barriers that stand in the way of more effective and safer policing.