Mamadou Diaw v. Ohio

Whether, after Carpenter v. United States, 585 U.S. 296 (2018), the Fourth Amendment permits law enforcement to obtain a single historical location data point associated with a user account on a third-party marketplace application—without a warrant—via a prosecutor’s subpoena issued under state statute.

Whether the “third-party doctrine” from Smith v. Maryland, 442 U.S. 735 (1979), and United States v. Miller, 425 U.S. 435 (1976), extends to historical app-location data where the government seeks targeted historical coordinates for investigative use, rather than business records reflecting non-locational account activity.