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You're ability -- when they -- the problem is when do you cross the line from being merely interested in looking at the sites to actually look building a weapon. the fbi's ability to interrupt that cycle, the operational cycle. that is a real challenge. >> dr. cole, tell me about ricin. how lethal is it, compared to like anthrax and the type we're seeing in the letters that were sent to the president. now the mayor of new york. how deadly could they be potentially in the wrong hands? >> worse case scenario it can be very deadly. tiny, tiny bits of dried powders ricin that would be breathed cou...

The problem is when do you cross the line from being merely interested in looking at the sites to actually look building a weapon. the fbi's ability to interrupt that cycle, the operational cycle. that is a real challenge. >> dr. cole, tell me about ricin. how lethal is it, compared to like anthrax and the type we're seeing in the letters that were sent to the president. now the mayor of new york. how deadly could they be potentially in the wrong hands? >> worse case scenario it can be very deadly. tiny, tiny bits of dried powders ricin that would be breathed could be fatal within 24 hours. on...

Basic freedoms of the internet. you know, your ability to go to a website or say things offensive to other people. when you -- the problem is, when do you cross the line, being nearly interested in looking at those sites to actually building a weapon. and the fbi's ability to interrupt that cycle, the operational cycle. and that's a real challenge. >> dr. cole, tell me about ricin. how lethal is it, compare it to something like anthrax. and the type that we're seeing in these letters that have been sent to the president, now the mayor of new york. how deadly could they be, potentially. in the ...