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You may have shock. you may have respiratory failure. it is a lethal poison. >> ian, are there different types of ricin and different parts of the country? is there a way to trace the actual poison itself? >> i don't think there is a way to trace the actual poison itself. but as was pointed out just a moment ago, there are so many other leads can you track as well. dna trace that's are left on letters and even such simple things as mentioned like zip codes can be instructive in trying to narrow it down. >> and, fran, before i let you go, are we just hearing a lot more about ricin cases? does t...

So it's going to hit those cells that have to turn over rapidly like the ones that lay in your gastrointestinal tract. particularly if you ingest it. or the cells of your respiratory tract. and depending on how it's ingested, it may have very different effects. so you may have diarrhea. you may have seizures. you may have shock. you may have respiratory failure. it is a lethal poison. >> ian, are there different types of ricin and different parts of the country? is there a way to trace the actual poison itself? >> i don't think there is a way to trace the actual poison itself. but as was point...