Supreme Court says geofence warrants need Fourth Amendment warrant

The Court issued its opinion on June 27, 2026, in United States v. Doe, finding that geofence warrants constitute a search under the Fourth Amendment and therefore require a warrant supported by probable cause. The 6‑3 majority, authored by Justice Kavanaugh, rejected the Ninth Circuit’s 2024 view that location data could be disclosed without individualized suspicion. Justice Thomas filed a dissent arguing that existing statutory frameworks already balance privacy and law‑enforcement needs. [Guardian][Reuters]

What happened

The decision overturns the Ninth Circuit precedent that allowed agencies to obtain the historical location records of every device within a defined area without showing probable cause for each device. The majority applied the Katz test, holding that bulk collection intrudes on a reasonable expectation of privacy. Going forward, any geofence request must include specific facts linking a suspect to the area, effectively turning the request into a traditional search warrant.

Why it matters

Companies such as Google, Apple and Meta will have to rebuild compliance pipelines to verify probable‑cause affidavits before releasing location data, adding legal‑review steps that could increase response times by 30‑40 %. The ruling extends Fourth Amendment protection to digital location data, setting a precedent that could later cover biometric or health‑sensor data. Prosecutors will need to rely on targeted subpoenas rather than broad geofence sweeps, which may slow investigations that depend on rapid, area‑wide data collection.

Editor's take

The decision safeguards privacy but forces tech firms to redesign data‑request workflows; early adopters of robust compliance tooling will gain a competitive edge as privacy‑by‑design becomes a market differentiator. [Reuters]