Researchers at University of Texas at Austin warned that UAVs could be turned into weapons by simply spoofing GPS signals.
Professor Todd Humphreys and his team were able to take control of a UAV by sending out a signal more powerful than the one coming down from the satellites
Once the drone had accepted the signal, he was able to attack by sending his own co-ordinates to the drone.
[thumb]http://www.foxnews.com/scitech/2012/06/25/drones-vulnerable-to-terrorist-hijacking-researchers-say/[/thumb]