Jake, the last time I heard the FPS over in Asheville, they were still on 415.2 MHz. In most areas they should be switching over to the 406-410 MHz section of the federal UHF band. But in some areas they might still be operating on 415.2, 417.2 etc..
I don't see much for North Carolina in the Wiki:
Federal Protective Service - The RadioReference Wiki
Sorry I can't give you some more concrete information.