On June 29, 2026, the Supreme Court ruled 6-3 in Chatrie v. United States that police must obtain a warrant backed by probable cause before compelling technology companies to produce geofence location data — records revealing which devices were present in a defined area during a specific window. Justice Elena Kagan, writing for a five-justice majority, held that individuals retain "a legitimate expectation of privacy" in cellphone location data even when that data sits on Google's servers rather than in their own pockets. The decision is the most significant digital-privacy ruling since Carpenter v. United States (2018) and reshapes how courts must evaluate an entire category of law enforcement surveillance.
The Bank, the Warrant, and the Three-Step Dragnet
The case began with a May 2019 armed robbery at a credit union in Midlothian, Virginia, in which thieves stole $195,000. When the investigation stalled, detectives obtained a geofence warrant directed at Google, defining a 150-meter circle around the bank and requesting all devices present during a one-hour window.
Google's response unfolded in three stages. First, it returned anonymized location data for 19 devices inside the geofence. Second, detectives asked Google to expand the time window and narrow the field to nine suspects whose movement patterns remained consistent. Third, Google de-anonymized the three remaining individuals — one of whom was Okello Chatrie, whose phone tracked directly from the bank to a residential area. Chatrie was convicted. His challenge to the warrant's constitutionality produced a 7-7 en banc deadlock in the Fourth Circuit, prompting the Supreme Court to take the case.
Building on Carpenter
Carpenter established that historical cell-site location information — the tower-ping records that place a phone near a given cell tower — is protected by the Fourth Amendment when sought for seven or more days. It left open whether shorter windows received the same protection, and whether more granular GPS-accurate data demanded the same analysis.
Chatrie closes both gaps. The geofence warrant here covered just two hours and used GPS-level data precise to within three meters — far more revealing than the carrier tower records at issue in Carpenter, which covered 129 days and 12,898 location points. The majority held that granularity, not duration, drives the constitutional analysis. Location data can expose "a wealth of detail about a person's familial, political, professional, religious, and sexual associations," Kagan wrote, and the brevity of the collection window does not dissolve that exposure.
The ruling also declines to rescue the third-party doctrine — the long-standing rule that information voluntarily shared with a business forfeits Fourth Amendment protection. The Court rejected the government's argument that users who opt into Google Location History implicitly consent to warrantless government access. As Kagan put it: "A new technology should not transform what individuals had reasonably thought they could withhold from the Government."
The Law Enforcement Case Deserves a Fair Hearing
Before treating this as an uncomplicated privacy victory, it is worth engaging the dissent's strongest argument. Geofence warrants have solved murders, child abductions, and arsons — precisely because they identify suspects investigators did not yet know existed. Requiring individualized probable cause before running an initial anonymized search seems to demand a conclusion as the price of beginning an investigation.
Justice Alito, dissenting (joined in part by Thomas and Barrett), warned the ruling would "send seismic waves through our Fourth Amendment doctrine" with implications "for the foreseeable future." That concern is real: the majority's reasoning — that detailed location data reveals intimate associations — will be cited by defendants challenging fitness-tracker records, smart-speaker logs, and connected-vehicle data. Courts will spend years mapping where the new line falls.
What Chatrie Holds — and Doesn't
The ruling is narrower than its headline suggests. The Court held that executing a geofence warrant constitutes a Fourth Amendment search. It did not hold that geofence warrants are unconstitutional — only that they require a valid warrant supported by probable cause. The case returns to the Fourth Circuit to determine whether this specific warrant satisfied those requirements, and whether the good-faith exception might shield the evidence regardless. Justice Jackson, joined by Sotomayor, filed a concurrence questioning whether Google's three-step expansion process itself violated the Fourth Amendment by broadening the search without returning to a magistrate between steps.
Google Already Moved On
The ruling's immediate practical impact at Google is close to zero. In 2023, Google announced it would migrate Location History from its own servers to individual users' devices — a transition completed by July 2025. Law enforcement can no longer send Google a geofence warrant and receive bulk data in return; there is nothing in Google's hands to produce. Chatrie matters most as constitutional precedent signaling to every other platform — Apple, Snapchat, Uber, Lyft, the full ecosystem of location-tracking apps — what the Fourth Amendment now demands of them when police come asking.
The Gap Chatrie Can't Close
The ruling says nothing about data brokers. These companies aggregate and sell precise location records — often more granular than anything Google's Sensorvault held — to commercial clients and directly to law enforcement agencies without a warrant. Because brokers sell voluntarily rather than being compelled, the Fourth Amendment's warrant requirement does not attach. Police bypass the warrant process entirely by purchasing what a court would otherwise require a warrant to compel.
Several states have enacted data broker registration and deletion-request laws, but none meaningfully restricts law enforcement access. The FTC has initiated rulemaking on commercial surveillance but has not completed it. A federal framework applying the Chatrie logic to commercially acquired government surveillance — requiring agencies to obtain warrants before purchasing location data from brokers — would close this gap. Without it, the constitutional protection Chatrie extends is real but easily routed around by any department with a subscription fee.
The Supreme Court has done what courts do well: updated a constitutional right to match a new technology. Requiring probable cause before conducting a location dragnet is proportionate and correct. The harder work — extending that logic to the commercial surveillance ecosystem that law enforcement now routinely taps — belongs to Congress.