Most states have a state police force of some type. They may be called - the State Police - the Highway Patrol - State Troopers - etc. Some states have specialized law enforcement bodies (i.e.- Texas...
Hawaii is the only state without a state law enforcement agency.
While there is no formal structure or chain of command (as inthe military), it would probably be the Attorney General of the United States.
State Attorney General, I believe.
Usually the State Police.
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