Copping a ’copter

In the hands of criminals, small drones could be a menace. Now is the time to think about how to detect them and knock them down safely

http://www.economist.com/node/21650071

In March, it [the French Government] held trials of anti-drone “detect and defeat” systems.

DroneShield’s system is centred on a sophisticated listening device that is able to detect, identify and locate an incoming drone based on the sound it makes