For the third time in recent months, a federal judge has balked at allowing government investigators to track a citizen via cell phone in real time without agents showing probable cause.

For the third time in recent months, a federal judge has balked at allowing government investigators to track a citizen via cell phone in real time without agents showing probable cause.
Andrew J. Peck, a magistrate judge with the U.S. District Court for the Southern District of New York, asked the Justice Department to clarify its arguments after learning that a Long Island magistrate judge initially denied a similar request in August.