For decades, there hasn't been consistent and comprehensive tracking of shootings by police officers in the United States.

But that's starting to change.

A number of organizations have begun compiling such data-- journalists at The Guardian, The Washington Post, KPCC, and researchers at UC Berkeley have all begun separate tracking efforts.

And last week, the California Department of Justice launched an online database to track police shootings and other uses of force in the state.

Washington Post reporter Kimbriell Kelly, KPCC data editor Chris Keller and UC Berkeley law professor Frank Zimring joined Take Two for a discussion about the challenges involved in compiling and analyzing data on police shootings.

To hear the full interview, click the blue player above.