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Deadly Poison Found in Letter Mailed to US Senator

An envelope tested positive for ricin at a Washington mail facility.
01:14 | 04/17/2013

Transcript for Deadly Poison Found in Letter Mailed to US Senator

A letter mailed to a mississippi senator has tested positive for the deadly poison ricin and the senate suspended mail delivery as investigators try to determine who sent it and why. Abc's senior... See More
This transcript has been automatically generated and may not be 100% accurate.
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