Utility and Numerical Evaluation of the Guilty Knowledge Test.
Final rept. Jan-Aug 92,
DEPARTMENT OF DEFENSE POLYGRAPH INST FORT MCCLELLAN AL
Pagination or Media Count:
Eighty subjects were given polygraph examinations utilizing the Guilty Knowledge Test GKT polygraph procedure in an effort to test the utility of this procedure in a mock crime situation. Additionally, a semi-objective numerical scoring system was implemented, modified, and evaluated. The subjects were broken down into two equal groups. The first group was programmed to commit the mock crime a burglaryhomicide. The second group did not commit the mock crime and was given no information regarding the details of the crime. Half of the sample twenty innocent and twenty guilty, was utilized to design the scoring system. The system was then tested on the remaining half. The GKT with the modified numerical scoring system correctly identified fifteen of twenty programmed guilty subjects and seventeen of twenty programmed innocent subjects, with one inconclusive decision. The overall accuracy rate for the GKT methodology utilized in this study was 82. AN