Recently uncovered government documents reveal that the U.S. Department of Homeland Security's (DHS) unmanned Predator B drone fleet has been custom designed to identify civilians carrying guns and track cell phone signals.

"I am very concerned that this technology will be used against law-abiding American firearms owners," said founder and executive vice president of the Second Amendment Foundation, Alan Gottlieb. “This could violate Fourth Amendment rights as well as Second Amendment rights."

Homeland Security design requirements specify that its Predator B drones “shall be capable of identifying a standing human being at night as likely armed or not” and must be equipped with “interception” systems capable of reading cell phone signals.

hat drone is not just picking up information on what's happening at that specific scene, it's picking up everything else that's going on," says drone expert and Brookings Institution senior fellow Peter Singer. "Basically it's recording footage from a lot of different people that it didn't have their approval to record footage.”

Last month, NBC News uncovered a confidential 16-page Justice Department memo that concluded the U.S. government may execute a drone strike on an American citizen it believes to be a “senior operational leader” of al-Qaeda or “an associated force.”

The Obama Administration defended the use of drones to kill Americans thought to be working with terrorists. “These strikes are legal, they are ethical, and they are wise,” said White House press secretary Jay Carney.