hook up with isis. >> because they know that isis has a lot of money. they know what isis' intent is. this february sting operation involving the fbi was a situation where one of the criminals was trying to pell pcms. talk to me about that. how dangerous is it if something like that fell into the wrong hands? >> it's very dangerous russ. a dirty bomb isn't a nuclear device. it doesn't use uranium or plutonium. it uses other more radioactive materials like cesium or amare sthee yum, cobalt, materials like that. these are actually stored in thousands of facilities in hundreds of countries. most of that material is fairly well secured. the reason you're worried about eastern europe, about russia in particular is that it's a corrupt, dysfunctional state. you see the kind of mentality the smugglers had in these stories.