From http://lyghtforce.com/survival-ark/

County sheriffs in Wyoming are insisting that all federal law enforcement officers and personnel from federal regulatory agencies must clear all their activities in a Wyoming county with the Sheriff's Office. Speaking at a press conference following the recent US District Court decision (case No 2:96-cv-099-J) Bighorn County Sheriff Dave Mattis stated that all federal officials are forbidden to enter his county without his prior approval.