Law Enforcement

Private police work for a company.
Campus, school, housing, transit, railroad, and special police are all examples of private police.
Depending on the type and state, private police may hold the same authority as a municipal officer over the general public.

Municipal police work for local governments, typically a city or town.
Examples include NYPD, CPD, LAPD, HPD and PPD.
This is the most common type of police in the U.S.
They hold primary jurisdiction for all emergencies in the municipality that they work for.

County police work for the county government or a county elected official, such as the Sheriff.
Examples include sheriffs, constables, marshals,
These agencies can have primary, secondary, or concurrent jurisdiction throughout the county.

State police work for the state government.
All states have a primary state police force (besides Hawaii, but that may change soon for Hawaii).
Examples include state troopers, highway police, capital police, game wardens, state park rangers, and waterways police.
These agencies have primary or concurrent jurisdiction statewide in respect to their agency's mission.

Bi-state police work for organizations formed by interstate compacts, or local governments.
Examples include port authorities and twin city agencies.
These agencies have jurisdiction and authority in two or more states under state authority.
Railroad police share this ability, but they don't need interstate compacts thanks to a combination of federal and state low.

Federal police work under the authority of the federal government.
Examples include the FBI, ATF, Secret Service, Tribal Police, and CBP.
These agencies have primary jurisdiction throughout the United States and its territories regarding their agency's mission.
Some states may deputize federal officers, allowing federal officers to enforce state law.
The Assimilative Crimes Act also allows federal officers to enforce state law on and around federal property, including state traffic laws. *Federal officers can also issue federal traffic tickets on federal property.*