As exponentially more government and law enforcement drones take to the skies over America, new research has highlighted the fact that the unmanned vehicles are extremely vulnerable and can be relatively easily hijacked and controlled.

Professor Todd Humphreys and his team at the University of Texas at Austin's Radionavigation Laboratory are warning that the drones could be "spoofed" and taken over by anyone with the right readily available equipment.

Fox News reports that Humphreys built an advanced spoofer at a cost of just $1000, and has successfully infiltrated the GPS systems of several drones. All he has to do is send a more powerful signal to the drone than it is receiving from an orbiting satellite and he can make the vehicle do anything he commands.