Sergeant1107
God Member
Offline
Posts: 730
Location: Connecticut, USA
Joined: May 21
st , 2005
Gender:
Re: failed 4th FBI polygraph yesterday
Reply #10 - Jun 17th , 2005 at 4:54pm
Mark & Quote Quote
Print Post
Regarding the FBI's 50% failure rate for applicants, I wouldn't have the slightest problem with that except for one thing: the false-positive rate. If polygraph "tests" were fifty percent accurate at detecting actual falsehoods (not just at measuring physiological changes in one's body, but at actually detecting deception) and also had a ZERO percent chance of rendering a false positive, then I would be more willing to support it. Then I would be more willing to endorse the theory that so many pro-polygraph people support, that of: "It's the best tool we have and it's better than nothing." If there was absolutely no chance of a false positive, and at least some small chance of actually detecting a lie, then I would agree that it was better than nothing. Then it might make sense to use a polygraph as a very small part of pre-employment screening. In that specific instance, a person who passed the polygraph might not have been telling the truth, but a person who failed would certainly have been lying. But as soon as you allow for even the most remote possibility that a subject can tell the absolute truth and still be judged to have "failed" the test, in my opinion the entire test process instantly becomes virtually worthless. Actually, it's worse than worthless, because people and governmental agencies will still rely on it even though it generates data which can only be considered useless. In my opinion, the only way to look at the results of a polygraph are as follows: - The subject "passed." That must mean that he wasn't deceptive, or that he used countermeasures successfully, or that the machine and the examiner failed to detect his deception... OR... - The subject "failed." That must mean that the subject was lying, or that he was using countermeasures and got caught, or was completely truthful but the machine/examiner interpreted the results as "deception indicated." I think that if the results of any "test" are broken down like that most people can see that, regardless of the results, you don't really know anything more after the "test" than you did before the test. Of course, most of this is moot since the polygraph doesn't detect lies or deceit anyway. But even if you generously agreed to the polygrapher's claim that "people respond in known ways when they lie" the utility of a test that can render three results (DI, NDI, and inconclusive), NONE of which are rendered with an accuracy rate even approaching 100%, is zero.