Mazel said counter surveillance of law enforcement agents is the fastest-growing way that organized criminals are using drones.
Some criminal organizations have begun to use drones as part of witness intimidation schemes: they continuously surveil police departments and precincts in order to see “who is going in and out of the facility and who might be co-operating with police,” he said.
A Criminal Gang Used a Drone Swarm To Obstruct an FBI Hostage Raid (cache)
This is only the beginning. Both fascinating and frightening.