Public safety is protected by Bloomington's 120 officer police force. The officers have sophisticated Ford Police Interceptor squad cars that assist them in their round-the-clock patrol: each contains a computer-assisted dispatching center that contains a computerized records system, mobile digital terminals that allow officers direct access to warrant information and state motor vehicle and driver's license records, and Opticom System equipment, which automatically switches traffic signals. The police force is also supported by six canine teams: four dual-purpose patrol dogs, a single-purpose narcotics dog, and a single-purpose explosives-detection dog assigned to the Mall of America. The police department has one of only four bomb squads in Minnesota and a highly trained 20 member SWAT team.