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Are written to senators. ricin is poisonous. there is no suspected link between the letter and boston bombings. but, michael, if this is ricin, what happens next in that kind of an investigation? >> well, i'm going to take a step back. i think we have to be very hesitant to say it is ricin. field tests quite routinely come back positive and ultimate scientific tests do not. so we don't know if it is. if it turns out to be ricin, whether there is any connection whatsoever to boston, that will take some time to develop. >> generally speaking, it's a separate investigation. they find ricin in a l...

University officials are releasing no other information pending permission from the family. brian? >> all right. thank you very much, chris live for us in boston. we'll see you later in the morning on "jansing & company." i want to bring together michael lightser. i guess now we know a little bit more about the bomb. so what sort of clues does that give us about maybe geography or who might be behind it? >> not that much, actually, brian. as people have reported, this bomb, this type of bomb has generally been used in south asia and it has been referred to by al qaeda in a magazine that al qae...