Psychologist, inventor of the discontinuous blood pressure method deception test, and author of the 1938 book The Lie Detector Test. Marston was the first to attempt to have instrumental deception test results entered into evidence in court, which resulted in the Frye decision of 1923. Marston’s test entailed the use of a conventional blood pressure cuff and sphygmomanometer with which he manually plotted the examinees blood pressure during questioning at several points during the interview. Marston’s work represented some of the early approaches to lie detection, though it could be considered polygraphy as it is now understood. Marston had several interests, and he was also the co-creator of the Wonder Woman comic book character. Both William Marston and his wife, Elizabeth, were lawyers and worked together to perform deception testing. See the discontinuous blood pressure method.