http://www.eweek.com/c/a/Mobile-and-Wir ... es-400606/
The Department of Justice is urging courts to allow law enforcement officials to obtain users' cell tower location data without a search warrant. The Electronic Frontier Foundation, the American Civil Liberties Union and other groups are objecting, and the courts have so far held that location information stored by a mobile phone provider is legally protected by the Fourth Amendment's prohibition against unreasonable searches and seizures.