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Support their breathing for them. if it was inhaled or injected, both of which can be deadly, you would -- there's been talk of an anti-dote. but there is no available one now. >> if these letters do have ricin, could the ricin have spread to other pieces of mail they just came in contact with for the regular sorting process? >> it could. and we talked about this with regard to anthrax so many years ago, this is different again, because in order for it to spread, the same sort of thing would apply here, you would have to be pretty sophisticated in terms of how it was weaponized. you go from en...

Very small, granular spore type things, it sounds unlikely. >> in the world of terror and people who follow and track this stuff, how high is ricin on the list of things people are concerned about? i mean, is it difficult to obtain? is it difficult to break down and weaponize as you said? >> well, the component pieces to a ricin compound are actually readily available. sanjay mentioned caster beans, that's the basic component, you crush it down and grind it. in the terrorism context, the way we saw it was as a contact poison which is the highly weaponized would be aerosolized. sanjay gupta des...

Envelope and possibly be poisoning other people. it can happen. but, again, based on what deb is describing, this sort of oilier substance as opposed to very small, almost granular spore type things, it sounds unlikely. >> in the world of terror and people who follow and track this stuff, how high is ricin on the list of things people are concerned about? is it difficult to obtain? is it difficult to break down and weaponize, as you said? >> well, the component pieces to rice income pound are actually readily available. sanjay mentioned caster beans, that's the basic component. and you crush i...