For obvious reasons, I will not go into details about the problems with drone flyovers, but they are a real concern. I will say that the airspace over nuclear facilities is restricted and small airplanes, including Cessnas, are not allowed to linger over any nuclear facility without permission and even large commercial jets have rules about flights near nuclear plants. We occasionally experience flyovers by military and police aircraft, and even local power company craft, but we always have advanced warnings with a description and even tail numbers. Any unusual or unexpected actions by manned aircraft would prompt a reaction by us and other authorities. I cannot, and will not, go any further in this discussion.
As far as payloads, I was not talking about Phantoms in particular. Larger, stronger uavs are being built every day, some of them more than capable of delivering sizable payloads.
I really didn't mean to start discussing security at nuke plants, I really just wanted to bring another view into the discussion of geofences and other means of keeping drones out of sensitive airspace.