When the police kill an unarmed black man, we know the family and community suffer. But what about other people – particularly Black Americans beyond those closest to the victim – what’s the impact on them? The spillover effect of police killings and other violence on Black Americans?

Our guest is Brentin Mock, a journalist who writes for CityLab.com, of the Atlantic. Mr. Mock’s article, “Police Killings and Violence Are Driving Black People Crazy,” explains the new studies that demonstrate the wide impact police killings and other violence have on Black people who are not themselves directly affected.

From Chad in Hawaii, a followup to our Nov. 6 episode on full legalization of marijuana in Canada: if the Canadian government has better data on drug-related crimes than the U.S., do they track other things that we don't? We put the question back to our friends up north.

The shooter in the Tree of Life synagogue murders pleads not guilty. David shares analysis on 90.5 WESA's The Confluence. 

We often hear about new methods police try to achieve better results against crime. But do the police have any reason to believe that their new approaches will work? Are their new initiatives based on hope, or on actual evidence that they will really help?

Our guest, Dr. Cynthia Lum, is Professor of Criminology and Director of the Center for Evidence Based Crime Policy, George Mason University. She’ll talk to us about Evidence Based Policing – and how she and her colleagues pioneered an approach that can make sure that what police want to do will really improve things. 

Apropos of nothing in particular, Bruce from Norwich, CT wants to know about the legal risks of knowingly giving false information to federal investigators.

Canada becomes the second country in the world to fully legalize marijuana. What happens next?

Routine traffic stops are the most common interaction between police and citizens. A new book presents the most unambiguous evidence yet that race is a critical factor in who gets pulled over and why.

Baumgartner, Epp & Shoub, Suspect Citizens: What 20 Million Traffic Stops Tell Us About Policing and Race (Cambridge UP 2018)

With every police shooting of an unarmed civilian, we hear calls for civilian oversight of police. But just creating an oversight agency is no magic bullet. What does a civilian review board need to succeed? What’s the evidence on the success of civilian oversight? Our guest, Brian Corr, is the President of the National Association for Civilian Oversight of Law Enforcement. He’ll talk to us about what makes for success – and what causes these attempts at reform to fail.

Civilian Oversight of Law Enforcement: Assessing the Evidence (2016)

Criminal Injustice is made in Pittsburgh, and Saturday's massacre hit us close to home in more ways than one. It's time to be very clear about what we mean by "free speech," and about what kinds of speech can never be accepted in a free society.

"After Synagogue Attack, Web-Hosting Sites Suspend Gab," NPR 10/29/18

In a rare moment of sanity, Pennsylvania lawmakers from both parties agree: revoking the driver's licenses of people convicted on non-driving-related charges doesn't help anybody.