The usual meaning is the abbreviation for "United States Marshals Service."
The United States Marshals Service (USMS) is a US federal law enforcement agency within the United States Department of Justice.
Yes, the FBI (Federal Bureau of Investigation) is a police agency. They're considered the "federal police".
The Police.
Pennsylvania had the first modern state police agency.
The police
In a rather literal naming scheme: Civilian Police Oversight Agency.
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It was the Pennsylvania State Police.
State Police
It depends on what you are referring to, however, in general, a non-police officer can work for or represent a polie agency, as long as that particular agency allows it.
It was the Pennsylvania State Police.
A police recruit is someone who is seeking employment with a police agency or who has been hired by an agency. Officers who are in the police academy or out on their first months of work are called recruits. Once they have completed all their training and qualifications, they are called police officers.