Government

"In a landmark decision, the U.S. Supreme Court ruled Friday that police must obtain a search warrant to access an individual's cellphone location information. The 5-4 decision imposes new limits on law enforcement's ability to get at the increasing amount of data that private companies amass in the modern technological age."

"Cellphone providers routinely keep location information for customers to help improve service. And until now, the prevailing legal theory was that if an individual voluntarily shares his information with a third party — for instance, by signing up for cellphone service — police can get that information without a search warrant."

"Writing for the court majority, Chief Justice John Roberts said that cellphone location information is a "near perfect" tool for government surveillance, analogous to an electronic monitoring ankle bracelet. The writers of the Constitution, he said, would certainly have understood that an individual has a privacy interest in the day-to-day, hour-to-hour and even minute-to-minute records of his whereabouts — a privacy interest that requires the government to get a search warrant before gaining access to that information."