The US doesn't have border security between states.
The closest thing to an exception is the "don't bring agricultural products into California" stations. However, there's a bypass lane for folks who stayed within 10 miles of the border, and no one checks whether someone is using that lane inappropriately.
That's why I pointed out that the Secretary of State can be fired at whim by an elected official while the "independent FCC commissioner" can't.
I apologize if my inference was incorrect.