FAA are not always the ‘good ol boys’ of 4 Holer’s dreams. If he has yet to get on the wrong side of them he is lucky.....or has seen the light and finally decided to be a law abiding citizen.
FAA will also crucify you for as little as a low range traffic DUI. A mate crossed the border from Nevada into California and 100 yards inside Calif got stopped, blew just under .08 which at the time was still OK in Nevada. But in CA that meant a DUI charge. FAA got on it and he lost his Check Airman privileges for a very long time. Took expensive lawyers to eventually recover his meal ticket.