CNN The Situation Room April 16, 2013 22:20:00
Tell our viewers here in the united states, and around the world, what you're learning. >> well, cnn has learned, wolf, that an envelope that was addressed and sent to a senate office was intercepted and tested positive for ricin poison. and i've learned that from congressional and law enforcement sources, myself and mike brooks, who actually got the first tip on this story. now, we don't know which senate office this was original hi sent to. but we do understand that this envelope was tested positive. and a first routine test, it was retested two more times, so it was tested three times all t...
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