did you put any polonium in the tea? >> of course not. i was tested for polonium, and i tested positive. did i put polonium into myself? am i an idiot? am i crazy? >> reporter: but scotland yard detectives don't believe lugovoi's denials. in fact, they think he tried kill litvinenko more than once. that's because they found polonium on the table in a conference room where he and litvinenko had met two weeks before the pine bar encounter. was anything spilled on the table? >> richard, you are asking questions. i remember some things, i don't remember other things. i cannot answer these questions because these can be used against me in the court, which is done frequently. >> reporter: as for his last meeting with litvinenko at the pine bar, lugovoi says there's no way he brought polonium on that trip because his wife and children were with him.