The Verge: How big a threat are drones on Inauguration Day?
Startups, like Department 13, claim they can take control of rogue drones. This is done by tricking the drones GPS system, making the drone believe it’s properly executing its mission, while actually moving it to safe coordinates.
http://www.theverge.com/2017/1/20/14335836/inauguration-day-drones-threat-bomb-security-detection-prevention