The National Security Agency (NSA) has produced a video about its polygraph screening program. Watch it here, along with AntiPolygraph.org’s commentary:
For a thorough debunking of polygraphy, with extensive citations (including the U.S. Government’s own polygraph literature) that you may check for yourself, see AntiPolygraph.org’s free book, The Lie Behind the Lie Detector (1 mb PDF).
See also these public statements by individuals who have gone through the NSA polygraph process:
And for discussion of polygraph matters, see the AntiPolygraph.org message board.