I too am a retired LEO command officer. You can talk about the FAA sending out guidelines all you want. The only reason my agency knows anything about drones is because, since I own a couple, I made sure we were up to speed and wrote policy on the matter. The majority of police could care less about the FAA guidelines. The reasoning is LEO's have enough on their plate without doing a federal agencies work for them. Public safety always comes first, however, flying over a closed power plant that most likely uses minimum wage security (if at all) would not be a concern unless you'd have to jump the fence to recover your drone.