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Polygraph and CVSA Forums >> Polygraph Procedure >> The Scientific Validity of Polygraph
https://antipolygraph.org/cgi-bin/forums/YaBB.pl?num=1011498360 Message started by J.B. McCloughan on Jan 20th, 2002 at 6:45am |
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Title: Re: The Scientific Validity of Polygraph Post by George W. Maschke on Feb 18th, 2002 at 10:38am
J.B.,
Before I address your questions, I note that you didn't really answer mine: 1) Do you agree that that the available peer-reviewed research has not proven that CQT polygraphy works at better than chance levels of accuracy under field conditions? If not, why? What peer-reviewed field research proves that CQT polygraphy works better than chance? And just how valid does that research prove it to be? I realize you averaged the Bersh and Barland & Raskin studies to come up with an average accuracy of 67.87? Do you seriously maintain that these two studies prove that CQT polygraphy works better than chance and that it is 67.87% accurate? By the way, you did not specify to which study by Barland & Raskin you were referring. I assume you are referring to the following non-peer-reviewed study discussed at p. 52-54 of the OTA report: Barland, G.H., and Raskin, D.C., "Validity and Reliability of Polygraph Examinations of Criminal Suspects," report No. 76-1, contract No. 75-N1-99-0001 (Washington, D. C.: National Institute of Justice, Department of Justice, 1976). 2) Do you agree that because CQT polygraphy lacks both standardization and control, it can have no validity? If not, why? Now, you mentioned that you read Chapter 1 of The Lie Behind the Lie Detector and found no reference to what standardization and control the CQT lacks. That reference is found at pp. 2-3 of the 1st digital edition, where we cite Furedy: Quote:
Other uncontrolled (and uncontrollable) variables that may reasonably be expected to affect the outcome of a polygraph interrogation include the subject's level of knowledge about CQT polygraphy (that is, whether he/she understands that it's a fraud) and whether the subject has employed countermeasures. You asked, "Can you reference, for comparison purposes, any other scientific method that has been accepted and its basis for acceptance?" I think Drew Richardson gave a good example in his remarks to the National Academy of Sciences on 17 October 2001, when he compared polygraphy to a test for a urinary metabolite of cocaine: http://antipolygraph.org/nas/richardson-transcript.shtml#control The test Dr. Richardson describes is genuinely standardized and controlled, unlike polygraphy. You also asked, "Can you reference, for comparison purposes, any other scientific method that was rejected based on comparable factors you might use to make this statement?" For comparison purposes, look to polygraphy's sister pseudosciences of phrenology and graphology. |
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