Invoking concerns about an Orwellian state of constant government surveillance, a federal judge in New York ruled last month that authorities must establish probable cause and secure a warrant in order to obtain historical location data covering an extended period of time from cell-phone providers about a criminal suspect. The court held that Fourth Amendment protections against unreasonable searches apply to “cell-site-location records,” which can indicate the round-the-clock whereabouts of customers, and rejected arguments by the government that a warrant was not necessary to obtain records covering a period of 113 days under the Stored Communications Act (part of the Electronic Communications Privacy Act). This decision is the latest in a string of decisions, adverse to the government, that raise doubt about the constitutionality of parts of ECPA and that complicate the decision-making of communications providers that must respond to government demands for information. Moreover, the opinion’s heavy reliance on United States v. Maynard, in which the D.C. Circuit found unconstitutional the warrantless use of GPS technology to track a person’s movements over the course of a month, also raises the stakes for the U.S. Supreme Court’s upcoming review of that case.