PDD test series attributed to John Reid in which all comparison questions are omitted from the question list, and an examinee is told to answer “yes” to all remaining test questions. It is preceded by special instruction so to invite physical countermeasures from guilty examinees. The Yes Test is especially useful in identifying examinees who wish to defeat the polygraph test and is generally used only when the examiner has reason to believe that the examinee is attempting countermeasures.
