The month before, a similar camera-equipped unmanned aerial vehicle (UAV) tumbled into spectators as it filmed a Virginia bull run. Chris Anderson of drone company 3D Robotics has estimated that there are already thousands of these unmanned devices in the air, where they can generally fly below 400 feet away from populated areas with no need for a license or permit. With a few exceptions, drones for hire are still illegal Government agencies, fire departments, some universities, and other public institutions can get case-by-case authorization to operate, which is why you see mosquito control groups looking for breeding sites with the Condor Aerial Maveric or police using drones in search-and-rescue missions.