Actually, you, sir (spelled with a c and a u) are the one who is ignorant. The Sheriff is the highest ranking authority of any county in the United States with law enforcement authority that supersedes every other agency including all federal agencies. Most people don't know that so I'm not surprised that you don't.
As a matter of fact, I am a licensed pilot and have been flying both full size aircraft and radio controlled aircraft for 30 years so don't presume to think that you know more than I do on the subject.
The reality is two-fold: First a foremost, the FAA has NO regulatory authority in these matters. They are simply using a "POLICY" written in 2007 to intimidate people. Read that word again: Policy. Policy is not regulation. The FAA knows they have no legal leg to stand on here otherwise they would have made a real regulation. Second: Sheriff's are elected officials and have to balance perception with pure law enforcement. Around here, there are too many people (read: growers and tinfoil hat types) who are worked into a lather about government surveillance.
The real question will be whether or not the FAA wants to risk the negative publicity when a lost 5-year old kid dies because they wouldn't allow a search & rescue UAV to be used. I personally would enjoy seeing Bill O'Reilly rip them a new one.