Can feds track your cell phone without a warrant? Supreme Court may decide

(CNNThe Supreme Court grappled with a major case involving privacy in the digital age on Wednesday, discussing how to apply established legal rules to rapidly changing technology.

Several of the justices struggled with the Trump administration's position that the government does not need a warrant when it seeks digital data from cell phones that reveal users' locations. Deputy Solicitor General Michael R. Dreeben stressed that individuals have diminished privacy rights when it comes to information that has been voluntarily turned over to a third-party, such as a phone company.

But while the justices pushed back on Dreeben's arguments, they didn't seem to all share the same rationale.

Justice Sonia Sotomayor, for example, said she feared a "dragnet sweep" on the part of the government and she noted that cell phones have become an "appendage" for people in the modern era. She noted that a cell phone can be pinged in bedrooms and doctor's offices.

"Most Americans, I still think, want to avoid Big Brother," she said. "They want to avoid the concept that government will be able to see and locate you anywhere you are at any point in time."

Other justices questioned whether they should draw a line based on the sensitivity of the data when considering what kind of information should trigger Fourth Amendment protections.

Justice Elena Kagan worried about long-term surveillance that she referred to as "24/7 tracking."

Chief Justice John Roberts seemed to disagree with the government's position that the collected information belonged to the cell service company and did not implicate the privacy of the customer.

"The person helps the company create the record by being there and sending out the pings," he said.

Justice Neil Gorsuch, alone, questioned whether the case should be decided on trespass grounds instead of taking a privacy-based approach.

Dreeben pushed back, telling the justices that while the technology is new, established legal protections are sufficient to deal with privacy concerns.

His arguments seemed to gain the most support from Justices Samuel Alito and Anthony Kennedy. Alito acknowledged the privacy concerns of new technology but he worried about existing precedent that the justices might "declare obsolete."

How the justices decide the case could provide a framework for other issues, including the future of the government's surveillance power. Privacy advocates say the case could impact everything from digital medical records and search queries on Google to smartwatch data.

Most courts have held that there is a diminished privacy interest when it comes to cell-site location data because the information has already been voluntarily provided to phone companies or third parties.

"This case is the first chance to start to set reasonable limits applicable to requests for these kinds of digital-age records by making clear that a warrant will sometimes be required," said Nathan Freed Wessler, an American Civil Liberties Union lawyer opposing the government in the case.

The case

The controversy arose after a string of nine armed robberies were carried out at Radio Shack and T-Mobile stores in Michigan and Ohio.

One of the robbers, who confessed to the crimes, gave the FBI his cell phone number and the numbers of other participants in the scheme. Pursuant to the Stored Communications Act, a law that authorizes the government to obtain cell service providers' records under certain circumstances, the FBI obtained cell-site data for a Timothy Carpenter. The information -- over a range of 127 days -- placed Carpenter in the vicinity of the robberies.

Carpenter was later convicted of aiding and abetting the crimes, based in part on the location data.

Lawyers for Carpenter moved to suppress the cell-site evidence, arguing that the "reasonable grounds" standard necessary for the information under the federal law was too low a bar. Instead, they argued that the Fourth Amendment required the government to obtain a search warrant pursuant to a higher standard of "probable cause" before obtaining the data.


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