Explosives probed for insight on San Bernardino attackers


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THE RACHEL MADDOW SHOW 12/3/15
Explosives probed for insight on San Bernardino attackers

Scriven King, explosive ordnance expert and national security professional with TAPSTRI, talks with Rachel Maddow about what investigators can learn about the San Bernardino shooters from the pipe bombs and other explosives they made. Duration: 9:14