The issue focused on the first use of the technology by a U.S. government agency and whether the Justice Department has sufficient safeguards in place.


The documents were released in response to a lawsuit from the Electronic Privacy Information Center and a class-action lawsuit filed by the American Civil Liberties Union on behalf of hundreds of cell phone users, which the Electronic Privacy Information Center said were also affected.


The documents were obtained from the Freedom of Information Act (FOIA) and provide the most detailed knowledge yet