Sure, I'd be happy to talk about this—it's a fascinating (and timely) case at the intersection of privacy, technology, and the Fourth Amendment. You probably meant Chatrie v. United States (Okello T. Chatrie is the petitioner; the name is often stylized as United States v. Chatrie in lower courts). It's the first Supreme Court case directly addressing geofence warrants, which are exactly what you described: court orders compelling companies like Google to search their location databases and identify every phone that was in a defined geographic area (the "geofence") during a specific time window around a crime.
scotusblog.com
Quick Background on the CaseIn May 2019, someone robbed a credit union in Midlothian, Virginia. Police had no immediate suspects or surveillance footage that helped much, so they applied for a geofence warrant from Google (the dominant provider of this data at the time). The warrant covered a 150-meter radius (about 300 meters across, or roughly three football fields) centered on the bank for a one-hour window (30 minutes before and after the robbery). That area included the bank, a nearby church, apartments, and other private spaces.
ca4.uscourts.gov
Google's Location History data (which users had to opt into) uses GPS, Wi-Fi, and cell signals to track devices with high precision. The warrant triggered Google's three-step process:
- Step 1: Google returns an anonymized list of all devices in the geofence during that hour (in this case, about 19 devices).
- Step 2: Police narrow it down by requesting more precise location data outside the initial window to eliminate innocent bystanders.
- Step 3: For the remaining devices relevant to the investigation, Google reveals account-identifying info (name, email, etc.).
One of those devices belonged to Okello Chatrie. Police used that (plus other evidence) to arrest and convict him of armed robbery. He moved to suppress the geofence evidence, arguing it violated the Fourth Amendment.
brookings.edu
Here's what a real geofence warrant looked like in a similar case (this one matches the scale and urban setting from Chatrie's):
warrantbuilder.com
And a simpler illustration of how geofencing works conceptually (pinning all devices in an area):
nlsblog.org
The Fourth Amendment IssuesThe core question is whether this kind of warrant is permissible under the Fourth Amendment, which protects against "unreasonable searches and seizures" and requires warrants to be supported by probable cause and describe with particularity "the place to be searched, and the persons or things to be seized."Key debates:
- Is it even a "search"? Under Carpenter v. United States (2018), police generally need a warrant for historical cell-site location information (CSLI) because it reveals intimate details of a person's movements and invades a reasonable expectation of privacy. Privacy advocates say geofence data is even more invasive—it's a "reverse search" or dragnet that sweeps up everyone in an area, not just a suspect. Critics (including the ACLU, Brennan Center, and others in amicus briefs) call it a modern general warrant—the kind the Founders hated, where officers could rummage through innocents' data without individualized suspicion.
aclu.org
- Particularity and probable cause? The district court agreed with Chatrie that the warrant failed these requirements. Police didn't have probable cause for every person whose phone might be in the geofence (most were innocent). The multi-step process gave too much discretion to police and Google after the initial warrant. It's like authorizing a search of every house on a block because one might have evidence.
brennancenter.org
- Good faith exception? The lower courts let the evidence in anyway under United States v. Leon (1984), because officers reasonably relied on the judge-approved warrant.
The Fifth Circuit (in a different 2024 case, United States v. Smith) ruled geofence warrants are categorically unconstitutional as overbroad general warrants. The Fourth Circuit (en banc in 2025) was badly fractured—14 judges issued a one-sentence per curiam affirmance, but with nine separate opinions totaling 126 pages and a 7-7 split on whether it was even a search. Most agreed the good-faith exception saved the evidence.
ca4.uscourts.gov
Where the Supreme Court Stands (as of April 15, 2026)The Court granted certiorari in January 2026, limited to whether the execution of this geofence warrant violated the Fourth Amendment (they didn't take up the exclusionary rule/good faith question). Oral arguments are set for April 27, 2026—just 12 days from now. No decision yet, and briefing is ongoing.
scotusblog.com
Privacy groups (ACLU, EPIC, Knight First Amendment Institute, etc.) have filed amicus briefs urging the Court to rule these warrants unconstitutional or at least strictly limit them—they chill free speech/association by letting police map who was at protests, churches, doctors' offices, etc. Law enforcement argues they're a valuable, narrowly tailored tool for "no-lead" crimes, bounded by time and space, and already subject to judicial review.
epic.org
Note: Google changed its policies in 2023–2024 (storing Location History locally on devices and shortening retention), which has already curtailed geofence warrants significantly. But the constitutional question remains huge for future "reverse search" tech.Why This MattersA broad ruling against geofence warrants could reshape digital policing (similar to how Carpenter did for CSLI). A narrow one upholding this specific warrant (perhaps on good faith or narrow tailoring) could greenlight wider use. Either way, it's a big test of how the Fourth Amendment adapts to always-on location tracking.If the decision drops this summer (typical for spring arguments), it'll be one to watch. Want me to dive deeper into any part—the lower court opinions, amicus arguments, or comparisons to Carpenter/Jones/Kyllo? Or updates after arguments? Just say the word!