Wikimedia Commons has media related to Police officers.

Police and sheriff's patrol officers maintain order, enforce laws and ordinances, and protect life and property within an assigned area. Depending on local law, they may perform a combination of the following duties: patrol a specific area on foot or in a vehicle; direct traffic; issue traffic summonses; investigate accidents; maintain public order; perform escort duties; apprehend and arrest suspects; or serve legal processes of courts.

Transit, transport and railroad police protect and police railroad and transit property, employees, or passengers.