Polygraph, Forensic Psychophysiology, commonly known as the polygraph, is based on the principal that fear of detection of deception causes physiological changes at the point of deception. & #xA; These changes are recorded and evaluated by a qualified forensic Psychophysiologist and the result made known to the subject and client. & #xA; All examiners utilized By P. D. D Examination Services has extensive experience in the application and have been trained by an APA Accredited Training Institute. & #xA; These examiners have extensive experience in the following fields; & #xA; Test Question Construction & #xA; Polygraph Techniques & #xA; Physiology and the Polygraph & #xA; Psychological Aspects of Polygraph & #xA; Test Data Analysis & #xA; & #xA; Through associations and set agreements we have a National Footprint and can also provide services in all our neighboring countries should it be required.