Concerns over security has resulted in systems being developed to bring down drones



British drone-freezing ray gets US airports trial - BBC News (http://www.bbc.co.uk/news/technology-36425879)

UK firms develop drone-freezing ray - BBC News (http://www.bbc.co.uk/news/technology-34475158)

AUDS - Anti UAV Defence Systems, UAV Detection, Counter Drone Airborne Surveillance | Enterprise Control Systems (http://www.enterprisecontrol.co.uk/product_detail.php/anti-uav-defence-system-auds)