Police Services -- City of Mission Viejo 27000 Crown Valley Pkwy, Mission Viejo, CA92691 Mission Viejo contracts with the Orange County Sheriff's Department for its police services. The Sheriff's Department…More is responsible for providing for the protection of citizens, the enforcement of laws and crime prevention. Law enforcement services include patrol, general and special crime investigation; traffic enforcement; collision investigation; parking enforcement; crime prevention and the Community Support Unit. The chief of police in Mission Viejo is Lt. Mike Gavin. He is responsible for the day-to-day operation of law enforcement services in the city. Additional police services include a canine unit, helicopter, bomb squad and forensics bureau. Its offices are in City Hall.