CNN Anderson Cooper 360 April 18, 2013 00:02:00
Both letters we're told signed "i'm kc and i approve this message." the letters have been sent to labs for testing. there had been ricin false-positives in the past. anderson? >> joe, last night we were told one of the letters was addressed from memphis, tennessee, postmark from memphis, tennessee. obviously, no return address on that letter. do we know how authorities were able to zero in on this particular suspect so quickly? was it somebody who had sent letters in the past and were somehow known to them? >> anderson, it's not at all clear right now, at least to us. we do know that throughou...
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