Police officers for the first time could be required to obtain warrants to get data on the past locations of criminal suspects based on cellphone use under a major case on privacy rights in the digital age taken up by the U.S. Supreme Court on Monday.

The justices agreed to hear an appeal by a man convicted in a series of armed robberies in Ohio and Michigan with the help of past cellphone location data who contends that without a warrant from a court such data amounts to an unreasonable search and seizure under the U.S. Constitution’s Fourth Amendment.

Read more at Reuters