In 2002, Breggin was hired as an expert witness by a survivor of the Columbine High School massacre in a case against the makers of an anti-depressant drug. In his report, Breggin noted that "... Eric Harris was suffering from a substance induced (Luvox-induced) mood disorder with depressive and manic features that had reached a psychotic level of violence and suicide. Absent persistent exposure to Luvox, Eric Harris probably would not have committed violence and suicide." However, the argument was rejected by the judge, and the lawsuit was eventually dropped with the stipulation that the makers of Luvox donate $10,000 to the American Cancer Society. In 2005, he testified as the medical expert in a trial in which a jury "returned a malpractice verdict against a shock doctor in favor of the injured patient". His testimony as a witness helped to win against the adherents of shock treatment and psychosurgery and it was announced as harmful.