The Department of Correction canine unit is responsible for conducting facility searches. These searches are often in conjunction with other entities such as the Emergency Service Unit, the Intelligence Unit, and the Special Search Team. The canine unit utilizes active alert German Shepherds, and passive Labradors to patrol the outer and inner perimeters of Rikers Island on every tour, monitor inmate outdoor recreation, respond to disabled vehicles with inmates on board, respond to disturbances within the department and a passive border collie canine to inspect all inmate’s in-coming mail.