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Detection of ricin alarms authorities already on edge
April 18, 201302:24

Rachel Maddow

Detection of ricin alarms authorities already on edge

02:24

Michael Leiter, NBC News National Security analyst and former director of the National Counter Terrorism Center, talks with Rachel Maddow about the poison ricin, which was detected in preliminary tests of a letter to Mississippi Senator Roger Wicker.April 18, 2013

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