Drones vulnerable to terrorist hijacking, researchers say

EXCLUSIVE: Drones vulnerable to terrorist hijacking, researchers say: "While jammers can cause problems by muddling GPS signals, spoofers are a giant leap forward in technology; they can actually manipulate navigation computers with false information that looks real. With his device -- what Humphreys calls the most advanced spoofer ever built (at a cost of just $1,000) -- he infiltrates the GPS system of the drone with a signal more powerful than the one coming down from the satellites orbiting high above the earth."