.... "Vigilant Video is compiling a vast database tracking Americans' movements, and it's no surprise that one of the most prolific users of surveillance, the NYPD, would seek to access it," Catherine Crump, a law professor at the University of California, Berkeley, told Ars. "But this data raises profound privacy issues, for the first time enabling the mass tracking of Americans, and we haven't even begun to have a meaningful conversation about what the appropriate uses are for this type of data."...