The City of Diamond Bar contracts with the Los Angeles County Sheriff's Department for all law enforcement services.
The Los Angeles County Sheriff's Department has more than 20 full-time personnel assigned to serve Diamond Bar. There are also 25 members of the Diamond Bar Volunteer Patrol who act as extra eyes and ears for the Sheriff's Department.
In addition to their on-the-job duties, police department personnel are also actively involved in conducting drug and crime awareness programs, and in serving on specialized rescue teams.
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