How can law enforcement prevent self-radicalization?

Aired: 12/4/2015 | 0:03:22 | Clip
A main concern following the San Bernardino mass shooting is how those in the U.S. may become radicalized -- and the challenge that poses to law enforcement trying to track those individuals. David Schanzer, Director of the Triangle Center on Terrorism and Homeland Security at Duke University joins Hari Sreenivasan.