SCOTUS in Chatrie v. United States Holds Location Data Fourth-Amendment Protected, Geofence Warrants Need Judicial Approval

On June 29, 2026, the Supreme Court ruled in Chatrie v. United States that individuals have a Fourth Amendment expectation of privacy in location data revealing their physical movements, and that even short-term surveillance of those movements is a search requiring a warrant. The ruling — the Court’s first major digital-surveillance decision since Carpenter v. United States (2018) — directly constrains law-enforcement and immigration agencies that have used geofence warrants (sweeping demands to providers like Google for the location data of every device in an area) without individualized warrant requirements.

This is a rare check cutting against the surveillance-expansion trend the timeline tracks. It bears directly on the warrantless data-broker purchases FBI Director Patel confirmed in 2026-03-18–patel-fbi-confirms-warrantless-purchase-commercial-data and on the broker-deletion rights established in 2026-06-16–vermont-data-privacy-online-surveillance-act-broker-deletion-rights. It sits in the Fourth Amendment lineage from Keith (1972-06-19–keith-case-fourth-amendment-domestic-surveillance-warrant) and against the third-party doctrine of Miller (1976-06-23–united-states-v-miller-bank-records-third-party-doctrine).

Read against the slip opinion directly (not commentary): the holding is confined to a compelled production (a warrant forcing Google to produce Location History) — the word “purchase” appears exactly once in the entire opinion set, in Alito’s dissent, as a hypothetical about Amazon purchase records, not data brokers. Chatrie does not reach the purchase-versus-compulsion question at all. The prior open lead — whether DHS/ICE legal memos try to cabin Chatrie to Google-style geofence demands while preserving broker-purchased location data as a workaround — has been substantively answered, though not by a Chatrie-specific memo: ICE already had a FOIA-documented, two-page legal memo (released via ACLU litigation, January 2026, five months before Chatrie) distinguishing purchased AdID-linked location data from Carpenter’s compelled CSLI. Because Chatrie doesn’t touch purchases, that pre-existing memo’s reasoning survives the ruling without needing amendment. See purchase-versus-search-doctrine-ice-legal-theory-cabining-carpenter-chatrie for the full documentary trail (ACLU FOIA, 404 Media’s Penlink/Webloc reporting, and the March 2026 congressional OIG referral Wyden and 70 Democrats sent after ICE cancelled a briefing on the subject). No memo citing Chatrie by name has surfaced in the public record as of 2026-08-27.