A Yamaha R-Max Unmanned Aerial Vehicle (UAV) sits before a crop dusting test flight at a University of California, Davis, test facility in Arbuckle, California, U.S., on Wednesday, Feb. 5 2014. UC Davis is one of five universities in the U.S. testing the use of unmanned helicopters for agriculture, but the only one studying the use of  pesticides. The Federal Aviation Administration (FAA) currently does not allow pesticide spraying from UAVs. Photographer: Ken James/Bloomberg via Getty Images