Defined by Dr. William J. Yankee in 1992 as the science that deals with the relationship and applications of PDD tests to the legal system. It is the academic discipline that provides the student, the practitioner, and the researcher with the theoretical and applied psychological, physiological, and psychophysiological fundamentals for a thorough understanding of PDD tests, and the skills and qualifications for conducting PDD examinations. The modifier “forensic” delineates and delimits this discipline from the broader discipline of psychophysiology. See: Yankee (1992).