Minimum Number of Polygraph Charts Required to Reach a Conclusion of Truth or Deception in Psychophysiological Veracity Examinations

"For many years, the American Polygraph Association’s standards of practice required that a minimum of two polygraph charts containing the same test questions had to be collected before a conclusion of truth or deception could be rendered. Th e assessment of the validity of any psychophysiological veracity test is based on the assumption that the test consistently measures the same properties."(...