Dr. Evans discussed his experience in private practice as a clinical and forensic psychologist, and experience as a C&P evaluator to describe the approach of forensic psychologists, contrasted against treating clinicians. He highlighted that diagnoses are working hypotheses in the clinical world, and that sub-threshold PTSD (not meeting all criteria for diagnosis) is nonetheless associated with functional impairment. Dr. Evans also noted the need to watch for under reporting and over reporting of symptoms, particularly under-reporting as it denotes and is caused by avoidance and emotional numbness, two symptoms of PTSD.