Test of a Mock Theft Scenario for Use in the Psychophysiological Detection of Deception: I.
Final rept. Jan-May 96,
DEPARTMENT OF DEFENSE POLYGRAPH INST FORT MCCLELLAN AL
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The Zone Comparison Test ZCT, a psychophysiological detection of deception PDD test, was administered to 20 subjects who were programmed to be deceptive or non-deceptive. This pilot study was designed to determine the effectiveness of the coin theft as a mock crime scenario for laboratory tests with the ZCT. The scenario instructions and pretest were videotaped. The test questions were presented using digitized voice. PDD tests were blind-evaluated by two independent scorers using the 3 position, ZCT scoring method. The frequencies of accurate determinations were compared using proportionality tests. The scorers rendered a decision in 62 of the cases, and were unable to reach a decision inconclusive calls in 38 of the cases. When inconclusives were excluded, the average accuracy was 84, significantly better than chance p .05. Neither scorer achieved an accuracy rate better than chance level. Interrater agreement was found to be nonsignificant Kappa for multiple raters, p .05. Despite the high accuracy rate found when inconclusives were excluded, the inconclusive rate and low interrater agreement rates suggest that this is not an effective laboratory mock crime procedure.