What kind of hand gun does police officers in California use?

Each law enforcement agency prescribes what sidearms may be carried by their officers. California agencies furnish handguns to their sworn employees, and these are usually a single brand and model. However, many agencies permit their officers to purchase and carry their own handguns, so long as they meet the agency's specifications. Therefore, there can be considerable variety in what you may see in California officers' holsters.

That said, the most common and popular police sidearm in the United States is the Glock pistol in .40 caliber.