Comparison of Psychophysiological State Inspected Before and After the Professional Certificate Examination with the Lie Detecting Specialty by Korea National Police Agency

This study was conducted to estimate the effectiveness of Vibra-Polygraph test used by Korea National Police Agency. To this end, 12 trainees from Gyonggi University polygraph examiner training course commissioned by Korea National Police Agency, completed the required educational course in the first half of 2024, were selected as investigators for the provincial police agencies. The testing inspection for psychophysiological state were conducted three times, before and after the comprehensive certificate examination date, and also at the beginning stage of this training course. Using MAUMLENZ system (MindEye Version 2.0), the first test was inspected at the initial stage of this training course, the second test was taken the day before the certificate examination, and the third test was measured 3 days after its certificate examination. As a result of comparing and analyzing the psychophysiological state indicators of the training subjects, comparing the negative emotions, positive emotions, and physiological state of 12 subjects, the serious state increased significantly to 45.5% the day before the certificate examination, but after the certificate examination, all were in normal or good condition and recovered in Vibraimage parameters. These research results are significant in that the evaluation of learning consciousness overcomes the problem of methodological validity, which is pointed out as a limitation of field research. This kind of test will be used to train investigative experts in the future polygraph investigator training course and the National Police Agency’s commissioned professional investigator training course. It is believed that it will be useful in accurately determining the quality of course education and learning effectiveness.