A senior scientist with the Center for National Security and Arms Control at Sandia National Laboratories checks out the new National Academy of Sciences (NAS) report on the reliability of polygraph screening in national security cases and finds that polygraphs are worse than worthless.

Late last year the NAS published its findings. It determined that the polygraph was not a worthless tool -- indeed, that it was much worse than worthless. The report said that "available evidence indicates that polygraph testing as currently used has extremely serious limitations . . . if the intent is both to identify security risks and protect valued employees." The NAS panel, made up of internationally respected psychologists and statisticians, further determined that the test was so nonspecific that even if the polygraphers managed to finally uncover their first spy, at least 100 innocent laboratory employees would have their clearances yanked because of the "false positives" inherent in the test. The NAS concluded: "Polygraph testing yields an unacceptable choice . . . between too many loyal employees falsely judged deceptive and too many major security threats left undetected. Its accuracy . . . is insufficient to justify reliance on its use in employee security screening in federal agencies." It doesn't get much clearer than that.