Warrantless cellphone border searches are at the center of a major case scheduled for oral argument before the U.S. Court of Appeals for the Second Circuit on June 24, 2025. In United States v. Smith, No. 24-1680 (2d Cir.), the court will decide whether federal agents can search a mobile device at the border without obtaining a warrant—and whether evidence from such a search should be suppressed if a constitutional violation occurred.