Believe it or not, if a fed is involved in a deadly force situation, and their ROEs are exponentially more lenient than that of cops, the local jurisdiction can’t really do much about it, unless they conduct their own independent investigation. The feds don’t have to cooperate.
Not sure if you’ve read up on what happened to Lavoy Finicum, but they straight up murdered that guy and the feds obstructed the State Police every step of the way.
Video of Finicum shooting
https://www.youtube.com/watch?v=YiuIN2DO6vo
Video inside Fincum’s truck.
https://www.youtube.com/watch?v=YiuIN2DO6vo