"During the pretest interview of a psychophysiological veracity (PV) examination, every effort is made to allay any fears the innocent examinee may have regarding the accuracy of the results of the examination, by explaining the scientific principles involved in the test, the sophistication of the polygraph instrument, and the complete objectivity of chart analysis through a numerical quantifi cation system or computer algorithm. However, the best pretest interview by the most competent polygraphist may sometimes fail to convince an examinee of the accuracy and reliability of the PV examination."(...)