Deadlands: The Flood
The Confederacy relies entirely on the military to do its interstate policing in the West. Regiments scattered through the Rebel states and territories have always held jurisdiction over local law. Of these units, one in particular has free reign over the entire Southwest—the Texas Rangers. These folks fought as regulars in the early years of the war, but they were later detached from the regular military to serve as a mounted police force.
The Texas Rangers have no particular authority in the Maze, though communities without a law dog in residence might turn to them for help enforcing local regulations and tracking down bandits.