So, the cop just asked you the same question three different ways. Why? If you're answering his questions, of course he's going to see if you're lying. Of course he wants to see if you're making something up or if your answers are the same every time. It's a very common tactic for the cop to ask the same question over and over. And make no mistake about this, that's a very effective tactic that they use. But if a cop is asking you the same question three different times, the only thing he should have heard three different times is I don't answer your questions without a lawyer.