by Lily Van Petten*
This Contribution argues that the sweeping data retrievals conducted via geofence warrants constitute Fourth Amendment searches for purposes of constitutional protections. The Fourth Circuit’s en banc decision in United States v. Chatrie avoided a definitive holding as to whether these investigatory tools pass constitutional muster. The court merely affirmed the district court’s holding that despite the occurrence of a Fourth Amendment violation, evidence would not be suppressed in the defendant’s criminal trial due to the good faith efforts of the investigating officers. The Fourth Circuit should have conclusively held that law enforcement’s use of a geofence warrant constitutes a search because individuals have a reasonable expectation of privacy in their location data under the Supreme Court’s decision in Carpenter v. United States, regardless of the fact that users share that data with third parties. As a result, a particularized search warrant stating probable cause must be obtained for each stage of data acquisition facilitated by a geofence warrant.