This is an alphabetical listing of departments who employ state and local law enforcement officials who have authored books.  You can also view the list of law enforcement agencies by state, here.

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Cabarrus County Sheriff's Office
Calhoun County Sheriff's Office
California Department of Fish and Game
California Department of Justice
California Highway Patrol
California State University, Fullerton Police Department
Cambridge Police Department
Campbell County Sheriff's Office
Cape Coral Police Department
Cape May County Sheriff's Office
Caroline County Sheriff's Department
Charleston Police Department
Chattanooga Police Department
Cherryvale Police Department
Cincinnati Police Department
Clare Police Department
Clayton County Sheriff's Department
Clearwater Police Department
Cleveland Police Department
Clever Police Department
Clinton Township Police Department
Cobb County Police Department
Cobb County Sheriff's Office
Collin County Sheriff's Office
Colma Police Department
Columbus Police Department (Kansas)
Columbus Police Department (Ohio)
Compton Police Department
Concord Police Department
Contra Costa County Sheriff’s Office
Cook County Sheriff's Office
Coral Gables Police Department
Cornelia Police Department
Cortland Police Department
Costa Mesa Police Department
Covina Police Department
Chicago Police Department
Chula Vista Police Department
Cumberland County Prosecutors Office