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[pre]American Polygraph Association (APA) president Skip Webb ultimately joined Secretary of Energy Bill Richardson in declining to explain how polygraphers are to handle subjects who admit to understanding the psychological manipulations on which polygraphy is theoretically dependent:
But American Polygraph Association member Scott Walters provides an answer in a 29 August 2000 article entitled, "The Rise in the Use of Countermeasures In Pre Employment and Specific Issue PDD Tests" and posted to the Florida Polygraph Association website. Admitting that polygraphy depends on the subject's ignorance of the true nature of the procedure, Walters laments:
Today, there is a vast amount of reference materials available on the subject of PDD testing [psychophysiological detection of deception testing -- a buzzphrase for "lie detector 'testing'"]. These reference materials are being published in an effort to improve the validity and accuracy of the Polygraph Examination, and to improve standards within the community of Polygraph Examiners as a whole. Unfortunately, it is also providing individuals with a greater knowledge of how the examination is administered and how the results are determined. How many times have you heard a subject make reference to his/her understanding of what the Comparison question is and why it is used. Thus, rendering any attempt at a Zone Comparison Technique (ZCT) all but useless as a means of determining the truthfulness of that subject.
All but useless.
Mr. Walters' article may be read in its entirety at:
The Zone Comparison Technique (ZCT) to which Mr. Walters refers is one of the most commonly used varieties of the probable-lie "Control" Question "Test." Mr. Walters' observations with regard to the ZCT hold true for other polygraph formats, including the directed-lie "Test" for Espionage and Sabotage (TES) adopted by DoD and DOE for security screening.
Like it or not, those in the polygraph trade are going to have to confront the question of what to do with those who understand "the lie behind the lie detector."
George Maschke AntiPolygraph.org [/pre]
[i]Last modification: George Maschke - 01/08/01 at 11:09:12[/i]