Using computers or “blind” scoring may not completely remove the effects of demeanor because cues in the examinee’s demeanor can alter the way the examination is given, and this may in turn affect the examinee’s physiological responses on the test.


We found many polygraph validation studies in which assessment was done only by tests of statistical significance without any attempt to estimate effect size or strength of association. We were unable to use these in our quantitative assessment of accuracy because they did not provide the raw data needed to calculate the accuracy index.

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