Along with NDI (No Deception Indicated) and Inconclusive, a conventional term for a polygraph outcome. A decision of DI in PDD means that (1) the physiological data are stable and interpretable, and (2) the evaluation criteria used by the examiner led him to conclude that the examinee is not wholly truthful to the relevant issue under investigation. The DI and NDI decision options are used primarily in single-issue testing, and they correspond with SR (Significant Response) or SPR (Significant Physiological Responses) and NSR (No Significant Response) or NSPR (No Significant Physiological Responses) in multiple-issue, or screening, examinations with the US Government.