Chatrie v. United States clarifies Fourth Amendment limits on location data—why it matters for phones, apps, and police warrants

The Supreme Court’s Chatrie v. United States decision (June 29, 2026) makes a clear constitutional point: when law enforcement uses a “geofence warrant” to obtain and review precise cellphone location-history records held by a technology provider, it counts as a Fourth Amendment “search.”

The Court vacated the lower court’s judgment and sent the case back for further proceedings. That remand matters because the Supreme Court did not issue a blanket rule that all geofence warrants are automatically unconstitutional.

What a “geofence warrant” means in practice

A geofence warrant is a warrant that targets phones based on where they were during a defined place-and-time window. In practice, it asks a provider to identify devices present in that area during that period, then produce the associated location-history information.

What data was at issue

In Chatrie, the government used a geofence approach to obtain and review cellphone Location History data connected to the phone(s) at issue from Google—provider-held records tied to where the phone appeared over time.

The Court’s core holding: acquisition and review are a “search”

The Supreme Court held that officers’ use of the geofence warrant to acquire and then review that provider-held location-history information constituted a Fourth Amendment search. That means courts must analyze these requests under Fourth Amendment “search” principles, rather than treating them as outside the Constitution’s warrant framework.

What the Court did next (and what remains open)

After finding this was a Fourth Amendment search, the Court vacated the lower court’s judgment and remanded. On remand, lower courts still have to address additional Fourth Amendment questions—such as whether the warrant was reasonable and properly authorized/tailored under the Fourth Amendment requirements for warrants.

Why this matters for future police requests

If investigators seek precise provider-held geolocation or location-history records, courts should expect more scrutiny through Fourth Amendment search analysis. That can affect how warrants are drafted and how challenges are litigated, especially around the scope and justification for obtaining location-history data.

What to watch next

The key next step is what the lower courts do on remand: whether the warrant in Chatrie is upheld or rejected under the remaining Fourth Amendment requirements. More broadly, expect continued motion practice over how narrowly (and with what constitutional justification) geofence warrants can be used to pull location-history records from providers.

Sources

• Supreme Court slip opinion: Chatrie v. United States (25-112) (June 29, 2026)
• Associated Press explainer (Supreme Court rules constitutional privacy protections apply to cellphone users' location history)