Most of us understand the common polygraph. All it amounts to is a device that crudely records physiological responses. The operator makes a big deal of wiring up the subject, asks a few questions and records the physical response of the body. So, let's say the subject under investigation is like Bill Clinton, an "exceptionally good liar." What would the polygraph operator see? Probably nothing. And, that is exactly why polygraph data are not allowed to be used in court. Clearly, the results are not dependable. In truth, the most important part of a polygraph test is the interview given...