"It opens up vulnerability. [UAVs] have a detailed structure, but they don't have any built-in protection against counterfeiting" a GPS signal, he said. "The FAA, its culture and its expertise is geared more toward safety than security. I think it is fair to say the DHS may have a role to play in drawing these rules or regulations [governing drones]. I'm worried they could be a weapon in the arsenal of organized crime"