**FILE** From right: Alan Davidson, director of public policy for Google; Guy Tribble, vice president for software technology at Apple; Justin Brookman, director of the Consumer Privacy Center for Democracy & Technology; and Ashkan Soltani, an independent researcher and consultant, testify May 10, 2011, on Capitol Hill before the Senate Privacy, Technology and the Law subcommittee hearing on the recent revelations about location tracking through cell phones. (Associated Press