The polygraph cannot provide the answers that Congressman Tom Davis seeks. While sometimes useful an interrogational prop, the polygraph has
no scientific basis as a lie detector. Moreover, the polygraph may be easily passed using simple countermeasures that polygraphers have no demonstrated ability to detect. To learn how to pass a polygraph whether or not you're telling the truth, see Chapters 3 & 4 of
AntiPolygraph.org's free e-book,
The Lie Behind the Lie Detector.