The Animal Kingdom park has lots of cool visual tricks so you can't see the things keeping the animals from eating the visitors (and/or vice versa). Things like ha-has can be made almost invisible from both sides, with good landscaping.

Has anyone come up with a way of attracting drones and then downing and taking possession of them? Could be high-tech hacking, or simply getting something grabbed by Google maps imagery that tempts people to fly their drones into the "confiscation zone". A profitable criminal enterprise. Or, of course, police could do this before doing something dodgy (a subtler version of the "EMP before planned police brutality" scene in Doctorow's Little Brother).