There's your answer. The purchase of ALL drones irrespective of size/weight must be accompanied with an app which MUST be registered with the CAA. Simples.
The future is undoubtedly drones. Little ones now and within 10 years there will be the first Cargo Airbus/Boeing pilotless aircraft.
I see an ISIS(?) drone expert was taken out recently by Mossad (I believe) because he was making significant progress arming drones and preparing them for delivery.
We don't hear much about drone free zone defence do we - is there such a thing?
Sorry for droning on.