Supreme Court: Geofence Warrants Are a Fourth Amendment Search - What It Means for Your Location Privacy

On Monday, June 29, 2026, the US Supreme Court ruled 6–3 in Chatrie v. United States that a “geofence warrant” - a demand for the location data of every device in a given area and time window - is a “search” under the Fourth Amendment. In plain terms: before police can sweep up a whole neighbourhood’s location records, they now need a warrant, and a narrowly tailored one. It’s a meaningful win for location privacy - but, as the rest of this article explains, it doesn’t end location tracking, and your own habits still matter.

What the Court actually held

Writing for the majority, Justice Elena Kagan held that people have a constitutionally protected privacy interest in their phone’s location records. The decision was joined by Chief Justice Roberts and Justices Sotomayor, Kavanaugh and Jackson. Justice Gorsuch concurred in the judgment in a separate opinion; Justices Alito, Thomas and Barrett dissented.

The core of Kagan’s reasoning, in her own words:

“An individual has a reasonable expectation of privacy in records about his cell phone’s location, and police intrude on that constitutionally protected interest when they demand the information.”

Because demanding that data is a search, the Fourth Amendment’s protections apply: law enforcement must get a warrant, and the warrant must be narrowly tailored rather than a blanket dragnet over everyone who happened to be nearby.

What a geofence warrant is

A geofence warrant flips ordinary policing on its head. Instead of identifying a suspect and then seeking their data, investigators draw a box on a map - an area plus a time window - and ask a provider (most famously Google) for every device that was inside it. The provider returns a list of anonymised device IDs and location pings, which police then narrow down and de-anonymise.

The problem is obvious once you see it: a geofence sweeps up everyone who was in the area - passers-by, neighbours, people in nearby buildings - not just a suspect. That is exactly the kind of broad, suspicionless collection the Fourth Amendment was written to check.

The Virginia case behind the ruling

The case grew out of a 2019 bank robbery in Virginia. To find a suspect, investigators obtained a geofence warrant that pulled Google Location History for every cell phone within a 150-metre radius of the robbery. That dragnet helped lead to Okello Chatrie. His lawyers challenged the warrant as an unconstitutional search - and that challenge is what ultimately reached the Supreme Court. The Court sent the case back to the lower court to weigh whether the search was “reasonable,” now that it’s settled that a search is what it was.

What it changes - and what it doesn’t

This is a real shift, and it’s worth being honest about its edges.

What it changes: Police can no longer treat a geofence as a routine data request. They need a warrant, and it has to be narrow. The broad “give us everyone in this area” dragnet - the version that scooped up bystanders - is now constitutionally suspect.

What it does not change:

• Targeted warrants still work. If police have a specific suspect and probable cause, they can still get that person’s location data. The ruling curbs dragnets, not all location requests.
• Data brokers are untouched. A huge volume of location data is bought and sold commercially - harvested from apps and sold by brokers. A Fourth Amendment ruling constrains government searches; it doesn’t stop a broker from selling your whereabouts to whoever pays.
• Your phone still generates the trail. The location history existed in the first place because devices and apps continuously log it. The ruling makes that trail harder for police to mass-demand - it doesn’t make the trail disappear.

In short: a strong limit on a specific surveillance technique, not the end of location tracking. Which is why the most reliable protection is still the part you control.

Protecting your own location data

You don’t have to wait for the next court case. The less location data exists about you, the less there is to demand, sell or leak:

• Minimise location history. Turn off or auto-delete Google Location History (and the equivalent on other accounts). Data that was never retained can’t be handed over.
• Audit app location permissions. Set apps to “while using” or “never” instead of “always,” and deny background location to anything that doesn’t truly need it. Most location-broker data starts as an app permission you granted without thinking.
• Use a privacy-respecting phone setup. A hardened, de-Googled phone dramatically shrinks the location trail tied to your identity. See our guides to the best privacy phone and GrapheneOS.
• Lock down your network footprint. Your IP and DNS lookups also reveal where you are and what you reach. See secure DNS, and consider a no-logs VPN to mask your IP on mobile data and public Wi-Fi.
• Pick tools that don’t hoard. When the underlying OS and apps collect less, there’s simply less location data in existence to subpoena or sell. See the most secure Linux distros for the same principle on the desktop.

The bottom line

In Chatrie v. United States, the Supreme Court ruled 6–3 that geofence warrants are Fourth Amendment searches: police now need a narrow warrant before demanding the location data of everyone in an area. As Justice Kagan put it, there’s a “reasonable expectation of privacy in records about his cell phone’s location.” It’s a genuine constitutional limit on a sweeping surveillance tool. But targeted warrants remain, data brokers keep selling location data, and your phone keeps generating the trail - so the durable protection is still to collect less, retain less, and lock down your phone and network today. (Sources: the US Supreme Court opinion in Chatrie v. United States, Justice Kagan’s majority opinion, the EFF, and reporting from CNN.)

Frequently asked questions

What did the Supreme Court rule about geofence warrants?

In Chatrie v. United States (decided June 29, 2026), the Court ruled 6–3 that a geofence warrant - a demand for the location data of every device in a given area and time window - is a “search” under the Fourth Amendment. That means police must obtain a warrant, narrowly tailored, before making such a demand. Justice Elena Kagan wrote the majority opinion.

What is a geofence warrant?

It’s a warrant that asks a provider (often Google) for every device that was inside a defined geographic area during a specific time window, rather than naming a known suspect first. In the case behind the ruling, a 2019 Virginia bank robbery, the warrant swept up Location History for every phone within a 150-metre radius. Civil-liberties groups object because it collects data on everyone nearby, not just a suspect.

Does this ruling stop all location tracking?

No. It limits government dragnets via geofence warrants. It does not stop targeted warrants against a specific suspect, and it does not touch the commercial data-broker market, where location data harvested from apps is bought and sold. Your devices and apps also keep generating location history. The ruling is a strong limit on one technique, not an end to location tracking.

What can I do to protect my location data?

Minimise and auto-delete your location history, tighten app location permissions (avoid “always”), use a hardened/de-Googled phone to shrink the trail tied to your identity, and lock down your network footprint with secure DNS and a no-logs VPN to mask your IP. The less location data exists about you, the less there is to demand, sell or leak.