One thing I don't get
These drones operate on radio frequencies, right ?
We can detect where radio signals come from, right ?
So why not just line airports with those famous radio goniometers and we have rapid triangulation of unauthorized radio transmissions near an airport.
Cue the sudden bursting in of burly policeman to the utter suprise of some idiot who then finds out the hard way what it's like to be beaten for 15 minutes with a bobby stick.
Confiscation of hovertoy follows, along with 1000 hours of community service.
I think that would put quite a damper on this kind of activity.