Pope, who sometimes serves as an expert witness in US courts, says he has been involved in dozens of murder cases where someone who was on steroids went on to kill somebody, who previously had no history of violence or crime beforehand. He also says wives and girlfriends are often the victim of men who are cranked up on steroids. In a study Pope found 23% of steroid users reporting major mood disturbances, including mania and major depression. Steroid users also reported aggressive or violent incidents. Several users reported they were expelled from their homes by parents, wives or girlfriends because they became intolerably aggressive.