There are 16 Regional Liaison Detectives that are staffed in various locations throughout the United States. The detectives provide coverage to areas generally not served by major Amtrak Police field offices and may individually cover as many as seven states. The detectives are responsible for investigating major crimes, assisting with locating missing persons, following up on train accidents, and providing aid to passengers aboard disabled trains. Detectives also serve on inter-agency task forces that are designed to combat specific types of crime that threaten homeland security. The detectives are also responsible for developing mutual aid partnerships with local, state, and federal agencies located in their areas of responsibility.