 In December 2012, the Electronic Privacy Information Center released documents which show the United States Department of Justice discussing the use of cell phone tracking equipment, including addressing unlawful interference concerns.More info on Stingrays was obtained in March 2013, when the American Civil Liberties Union released documents it obtained via a Freedom of Information Act request.Stingray devices have been used in a variety of criminal investigations, from murder and kidnapping to misdemeanor theft.