The modern concept of torture methods that leave no physical evidence is noted in 1995 by the Diagnostic and Statistical Manual of Mental Disorders DSM-IV within the changing definition of Post-traumatic Stress Disorder PTSD. This revised definition included psychological torture stating: "Expresses concern that the Diagnostic and Statistical Manual of Mental Disorders definition of posttraumatic stress disorder does not include those forms of psychological torture in which the physical integrity of a person is not threatened. It is suggested that any diagnostic criterion that characterizes the traumatic stressors leading to PTSD should be expressed in such a way that psychological forms of torture are included."