Yes, I was watching a thing on the brain about this. There are seperate parts of the brain that is used when you lie. There are two kinds of lies that can be detected at the moment. There is the lie that you are aware of and is made up on the spot so to speak, and there is the lie that you may not be aware of, or practised all the answers to. There is some research in catscan type equitment that may be used in the near future to replace the traditional lie detector. As the technology grows, the lie itself will be detected and not the side effects of lying. I wish I wasn't so lazy or I'd try and track down a link to it. I'm sure there's some info out there somewhere on it.