The Emergency Service Unit (ESU) is a police tactical unit which provides specialized equipment, expertise and support to the various units within the police departments. These police forces do not have a traditional S.W.A.T. unit. The Emergency Service Unit qualifies in the role of a S.W.A.T. unit and much more. From auto accidents to building collapses to hostage situations, "ESU" officers are called on when the situation requires advanced equipment and expertise. The K-9 Unit provides assistance during searches for missing persons, perpetrators and evidence such as drugs and contraband.