Accession Number:

ADA305755

Title:

An Evaluation of the Effectiveness of the Polygraph Automated Scoring System (PASS) in Detecting Deception in a Mock Crime Analog Study.

Descriptive Note:

Final rept. May 93-Mar 94,

Corporate Author:

DEPARTMENT OF DEFENSE POLYGRAPH INST FORT MCCLELLAN AL

Personal Author(s):

Report Date:

1994-03-01

Pagination or Media Count:

82.0

Abstract:

The purpose of this research was to evaluate the effectiveness of a prototype scoring alogorithm, the Polygraph Automated Scoring System PASS, version 2.0, when analyzing mock crime data. A database of psychophysiological detection of deception PDD measurements was collected using the Axciton Polygraph System. The PDD test format used was the Zone Comparison Test ZCT. In addition, two types of control question tests CQTs were used during the study a an experimental version of the directed lie control DLC, and b the conventional probable lie control PLC currently in use throughout the PDD community. The data set is composed of 120 local civilian citizens who underwent a PDD examination, half of which committed a mock theft of money. The results showed that PASS accuracy on controlled laboratory data with known ground truth as far below that attained by APL during algorithm development when using live PDD examinations. In fact, rates of accuracy for both PASS and the PDD examiners were lower than anticipated. PASS was clearly more accurate in identifying individuals who had been programmed innocent, while the PDD examiners were more accurate in detecting individuals who had been programmed guilty. Use of the DLC versus the PLC made no apparent difference in overall accuracy for either PASS or the PDD examiners, though there were statistically significant differences when analyzed from the standpoint of - programmed condition. Analysis also showed a PDD examiner performance decrement over time which contributed to the lower than expected examiner accuracy rates. AN

Subject Categories:

  • Psychology
  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE