The number and type of staff who make up the psychiatric emergency team varies significantly, depending upon the type of facility, the number of cases, the severity of the presenting psychiatric problems, and the skills of the available staff members. A psychiatric emergency can occur anywhere. Many useful staffing patterns are available to administrators and administrator clinicians for organizing a psychiatric emergency service. The roles and responsibilities of the various staff members derive partly from their training and partly from the needs of the specific system in which they work. Emergency physicians have begun to assume more responsibility for the behavioral aspects of emergency medicine, especially since their training expertise now includes a "behavioral" component. Emergency physicians can manage many behavioral emergencies: drug overdoses, organic brain syndromes, the abused child, the rape victim. Psychologists participate on psychiatric emergency teams in some hospitals and community mental health centers. At the doctoral level, psychologists occasionally lead the crisis intervention team.