A prototype quadrotor unmanned aerial vehicle (UAV) in the Unmanned Systems Laboratory at the Naval Postgraduate School is tested on Septempter 30, 2011 in Monterey, California.

As U.S. authorities grapple with how to regulate the use of unarmed drones in U.S. skies, a small network of police, first responders and experts is already flying unmanned aircraft.

These operators say rapidly evolving drone technology is already reshaping disaster response, crime scene reconstruction, crisis management and tactical operations.