We don't really need any new robotics laws, a'la Isaac Asimov. Shooting one of these down if it's over your property and you do not want it there ought to be considered citizen apprehension, for police inspection, of a criminal tool. Sorry if somebody paid several thousand dollars for a top of the line drone, but if they bought a $200 thousand Maserati that would give them no more right to drive it into someone's backyard than if they owned a beater.
But you can photograph with a long lens. I suspect for now, that's the comparison. I don't agree. Then when you photograph through a window, all kinds of other reprecussions. Rational lawmakers could easily solve this problem.