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BySRSam Reyes·CMCal Morrow·EQEliza Quinn·DPDana Park
BREAKINGApril 27, 2026

Supreme Court to weigh use of 'geofence warrants' by law enforcement

The Supreme Court heard oral arguments on April 27, 2026 in Chatrie v. United States, a case examining whether geofence warrants — which compel tech companies like Google to hand over location data for all devices near a crime scene during a specific time window — violate the Fourth Amendment. The case stems from a 2019 bank robbery in Midlothian, Virginia, where police used a geofence warrant directed at Google to eventually identify the suspect. The Court is being asked to resolve a circuit split between the 4th and 5th Circuit Courts of Appeals over whether geofencing even constitutes a 'search' under the Constitution.

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⚡The conservative argument represents the dominant position. A significant conservative faction disagrees — see The Divide below.

Police can now reverse-search a location to find everyone's phone that was there at a specific time. The Court has to decide: does that mass data collection without individual suspicion violate the Fourth Amendment, or is it just following the digital breadcrumbs?

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Geofence warrant as general warrant
Conservative
The Framers' general warrant was a roving, open-ended license to search whoever and whatever the Crown chose — no crime specified, no location fixed, no judicial check. The Chatrie warrant named a specific bank robbery, a 150-meter radius, and a 30-minute window, and required a magistrate's signature before it issued. That is not a general warrant. That is the particular, judicially supervised search the Fourth Amendment was written to permit.
Liberal
You're describing the outer shell of particularity — a radius, a timeframe, a judge's signature — but ignoring what the warrant actually captured: every person who happened to be near that bank, none of them suspected of anything. The Framers didn't define a general warrant by whether it named a building. They defined it by whether it required prior suspicion of the person being searched. This warrant required none.
Conservative
By that logic, a wiretap on a phone used to plan a robbery is unconstitutional because it captures anyone who calls that number, including innocents — but courts have never read the Fourth Amendment that way. The question is whether there's probable cause for the search, not whether every result of the search is a guilty party.
Liberal
A wiretap starts with a specific suspect and intercepts their communications. A geofence starts with a location and asks who was there — those are structurally opposite investigations, and treating them as equivalent is how we end up with dragnet searches wearing the costume of targeted ones.
Third-party doctrine's digital limits
Conservative
Carpenter didn't abolish the third-party doctrine — it carved a narrow exception for months of comprehensive location tracking that could reconstruct a person's entire life. A 30-minute geofence is not a life-map. It is closer to asking bystanders who was present at a crime scene than to the years of surveillance data Carpenter prohibited. The Court drew a line, and this case falls on the warrant-permitted side of it.
Liberal
You're right that Carpenter preserved the doctrine for narrow cases — but you're assuming a 30-minute geofence qualifies as narrow because the clock is short. What makes Carpenter's data 'comprehensive' isn't duration alone; it's that location data reveals private conduct without any conscious disclosure. The person in that café near the bank never chose to tell Google, let alone the government, where they were that morning.
Conservative
That logic would require a warrant for every security camera, every E-ZPass reader, every cell tower ping — any passive capture of location in public space. Carpenter's reasoning was explicitly limited to 'the seismic shift' of comprehensive digital tracking, not every incidental record of presence.
Liberal
Security cameras and E-ZPass capture specific, bounded transactions in public; geofencing reverse-engineers a population from continuous automated tracking of private devices. The distinction isn't pedantic — it's the entire reason Carpenter refused to let the third-party doctrine swallow the Fourth Amendment.
Three-step narrowing as constitutional safeguard
Conservative
The Chatrie geofence produced identifying information for exactly three accounts — three — out of everyone within that radius, and only one person was ever charged. That is a system working as designed: starting with a judicially authorized area and narrowing through a structured, supervised process to a single suspect. Calling that a dragnet misrepresents how the data was actually used.
Liberal
The fact that only one person was charged doesn't tell us how many were investigated, profiled, or simply added to a government database before being cleared. The constitutional problem with a dragnet isn't only that innocent people get convicted — it's that they get searched. Every one of those accounts that Google handed over belonged to a person whose location history was examined by law enforcement without any prior suspicion directed at them specifically.
Conservative
You're treating exposure to investigation as equivalent to a constitutional violation, which would make every lineup identification, every canvass of witnesses, every neighborhood inquiry unconstitutional the moment an innocent person participates. The Fourth Amendment regulates unreasonable searches — not all investigative contact with people who turn out to be innocent.
Liberal
A lineup is voluntary and in person; you know you're participating. A geofence search happens without your knowledge, without your consent, and without any suspicion you've done anything wrong — that asymmetry is precisely what makes it the kind of general, suspicionless search the Amendment prohibits.
Chilling effect on political assembly
Conservative
The January 6 example proves the tool can work — law enforcement identified real participants in a genuine attack on democratic process using geofence data. The chilling effect argument assumes that everyone at a protest is a potential target, but the Fourth Amendment governs how evidence is used, not whether people choose to attend events. The solution to overreach is judicial oversight, not disabling the technology entirely.
Liberal
You're conceding that the same tool that captured rioters also captured every journalist, staffer, and lawful protester on the Capitol grounds that day — and then asking us to trust that discretion will sort them out. But discretion is not a constitutional safeguard. The particularity requirement exists precisely because we don't trust unlimited prosecutorial discretion, and 'we only charged the guilty ones' is not a defense of the search, it's a description of its aftermath.
Conservative
Judicial oversight is your safeguard — it's not a consolation prize. If the problem is prosecutors misusing location data after the fact, the remedy is suppression, not a categorical rule that forecloses every geofence request regardless of how narrowly drawn.
Liberal
Suppression only helps after you've been prosecuted — it does nothing for the thousands of people whose location data sits in a government database because they attended a protest. The chilling effect lands before any charges are filed, and no suppression motion fixes the deterrence damage already done.
Voluntary disclosure and meaningful consent
Conservative
The DOJ's framing — that anyone who 'took no steps to protect' their location waives all privacy rights — is too sweeping, and conservatives should be the first to say so. But the baseline principle holds: Google location history is an opt-in feature, and someone who enables it has made a choice about how their data is handled. Courts have to work with the choices people actually make, not the choices they might have made with perfect information.
Liberal
Opt-in is doing enormous work in that sentence. In 2019, Google's location history setting was buried in account settings, toggled on by default for many users during device setup, and disclosed in a terms-of-service document that runs thousands of words. Calling that a 'voluntary choice' to surrender Fourth Amendment rights to the government is a fiction the Court already began unwinding in Carpenter — the question is whether they'll finish the job here.
Conservative
Carpenter's holding was about the comprehensiveness of the data, not the adequacy of the disclosure. If your argument is that Google's consent interface is inadequate, the remedy is consumer protection law and FTC enforcement — not a constitutional rule that insulates criminals from investigation because tech companies write confusing privacy policies.
Liberal
Constitutional rights don't get outsourced to Silicon Valley's UX designers. If the adequacy of a company's consent flow determines whether the government can search you without suspicion, then privacy becomes whatever Google decides it is — and that is a stranger position for a small-government conservative to defend than anything in Carpenter.
Conservative's hardest question
The DOJ's claim that any user who opted into Google location history surrenders privacy expectations entirely — 'with or without a warrant' — is constitutionally untenable in a post-Carpenter world and, if accepted, would have implications far beyond this case that should alarm conservatives concerned about government surveillance of gun purchases, religious attendance, and political assembly.
Liberal's hardest question
The Chatrie geofence was genuinely narrow — 150 meters, 30 minutes, a violent felony — and police did obtain judicial approval before proceeding. A court sympathetic to the warrant requirement but skeptical of categorical rules could uphold this specific warrant while demanding stronger particularity in future cases, which would undercut the argument that geofencing is structurally incompatible with the Fourth Amendment rather than just poorly regulated.
The Divide
*Even as progressives cry dragnet, some constitutional conservatives are asking whether geofence warrants really respect the Fourth Amendment's demand for particularity.*
LAW-AND-ORDER
Geofence warrants are constitutional under the third-party doctrine and essential for law enforcement.
“Because the defendant took no steps to protect his location from disclosure, he has no right to privacy with or without a warrant.” — Trump Administration (DOJ)
CIVIL-LIBERTARIAN RIGHT
Dragnet geofence requests sweep up innocents and conflict with Fourth Amendment particularity requirements.
The Verdict
Both sides agree
Both sides accept that the Carpenter v. United States (2018) precedent was a genuine shift in Fourth Amendment doctrine and that some meaningful judicial constraint on location data requests is now constitutionally required—the disagreement is only about whether geofencing fits within or falls outside that constraint.
The real conflict
FACT/PREDICTION: Whether the three-step narrowing process Google performed actually produced specificity from ambiguity (conservative framing) or progressively expanded an initial dragnet into actionable prosecutorial advantage (liberal framing)—the raw data is identical, but its constitutional meaning depends on whether you weigh the constraint (three accounts identified) or the initial cast (everyone in 150 meters).
What nobody has answered
If the Court rules that geofencing is a 'search' requiring a warrant (satisfying the liberal baseline), what particularity standard actually prevents a warrant for 'all devices within two miles of a protest' for six hours on a politically volatile day—and how would a judge reviewing such a warrant in real time, before knowing who attended or what actually happened, distinguish it from the bank robbery geofence the Court just approved?
Sources

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