New York Police Covertly Tracked Cell Phones

New York City's police have made extensive use of covert devices to track cell phones without obtaining warrants since 2008, a civil liberties group said on Thursday, revealing how frequently law enforcement in the largest U.S. city has employed the technology.

New York City's police have made extensive use of covert devices to track cell phones without obtaining warrants since 2008, a civil liberties group said on Thursday, revealing how frequently law enforcement in the largest U.S. city has employed the technology.