Re: @DougS
"...but since drones communicate using public airwaves that you can use too, there's nothing stopping you from jamming the frequency it is using so the operator loses control and it crashes."
Actually, that isn't true - at least not in the US. The FCC has some pretty clear prohibitions on jamming. For example this and also this so, jamming RF is just as illegal as the snooping you are trying to stop.