This undated handout photo provided by the U.S. Patent and Trademark Office shows the StingRay II, manufactured by Harris Corporation, of Melbourne, Fla., a cellular site simulator used for surveillance purposes. A police officer testified Wednesday, April 8, 2015, that the Baltimore Police Department has used Hailstorm, a upgraded version of the StringRay surveillance device, 4,300 times and believes it is under orders by the U.S. government to withhold evidence from criminal trials and ignore subpoenas in cases where the device is used.