When can police use GPS to track suspects?

WASHINGTON (AP) — A 2-year-old Supreme Court decision has caused more confusion than clarity on how police may track the whereabouts of criminal suspects, illustrating how hard it is for the slow-moving judicial system to keep up with the light speed of technology.In the case of United States v. Jones, decided in January 2012, the justices unanimously affirmed a lower court ruling that police erred when, without a valid warrant, they attached a GPS tracking device to the Jeep of a Washington, D.C., nightclub owner, leading them to a stash house for drugs.

But in three separate opinions, the justices offered different legal rationales for that decision. That left a muddled legal landscape for police and lower-court judges, who have since struggled with how to apply it to a world where privacy and technology increasingly collide.