A North Carolina police department has been secretly gathering data from cellphones and other mobile devices with military-grade surveillance equipment. But the surveillance systems, which are supposed to be used to locate criminal suspects, are also tracking everyone else. The Charlotte-Mecklenburg police department, which serves nearly a million North Carolina residents, has been using portable surveillance systems that masquerade as a cell phone tower and picks up nearby wireless data on phones, laptops and other devices, The Charlotte Observer reported.