someone's tea cup and everyone's laughing at it? i mean, the state cannot be involved in that. >> litvinenko's friend paul joyal, who believes he was the target of a botched assassination, agrees that in some ways litvinenko's killers were indeed clumsy and careless. but he says that's because they were probably just pawns in a much bigger game. >> do you think that any of them knew what that substance was? do you think that they knew they were handling polonium? >> why wouldn't they have known what they were handling? >> because you don't want them to know. >> but they could have done a better job not spreading it all over the place if they knew. >> they also might say no, there's no way i'm going to do that. >> i don't want to handle that radioactive material? >> i am not going to kill myself in the process. >> to get closer to the truth about who killed litvinenko, we had to talk to the suspects themselves, andrei lugovoi and dmitri kovtun. in kovtun's case, it wasn't easy.