This document summarizes the 1976 California Supreme Court case Tarasoff v. Regents of the University of California. In the case, the court ruled that when a mental health professional determines a patient poses a serious danger to a specific individual, the professional has a duty to use reasonable care to protect that individual. This may include warning the intended victim or notifying authorities. The case involved a psychologist who did not warn the victim after his patient said he intended to kill her.