US Marshal Police (Washington DC) are Judges, State Police are Attorneys and City Police are Lawyers and this is called Capitol Government.
Washington DC is the Capitol of a Country and is a City insides of Counties inside of United States.
The State is the Capitol of a Territory and is a City insde of Counties.
The City is the Capitol of a County.
Generally, the Counties are Army with Navy approved Sheriffs beyond the city limits where there is substantial Army – Military Police Authority.