Digital Dragnet or Lawful Tool? The Supreme Court Reconsiders Geofence Warrants

A case currently pending before the United States Supreme Court marks one of the most consequential and highly anticipated Fourth Amendment decisions in recent history.

At issue is whether so-called “geofence warrants,” a rapidly expanding investigative technique, are compatible with constitutional protections against unreasonable searches. The case, captioned Chatrie v. United States, forces the Court to grapple with a foundational question: how far can law enforcement go when the “place to be searched” is not a person or property, but a dataset containing the movements of potentially dozens, or even hundreds, of individuals?

What Are Geofence Warrants?

Geofence warrants invert the traditional investigative model. Instead of identifying a suspect first and then seeking targeted data, law enforcement requests location data from technology companies (e.g., Google) for all devices within a defined geographic area during a specific timeframe.

In practice, this process often unfolds in stages. Police initially receive anonymized location data tied to device identifiers. They then narrow the dataset based on movement patterns or proximity to the crime, ultimately requesting identifying information for select devices/

The result is a powerful investigative tool; one that can place a suspect at the scene of a crime. But it also sweeps in data from numerous innocent individuals, raising concerns that such warrants resemble the “general warrants” the Fourth Amendment was designed to prohibit.

The Case: Chatrie v. United States

The case arises from a 2019 bank robbery in Virginia. Investigators used a geofence warrant to obtain location data from devices near the crime scene, ultimately identifying and prosecuting Okello Chatrie. Chatrie challenged the warrant, arguing that it constituted an unconstitutional dragnet search. Although a lower court agreed the warrant was problematic, it declined to suppress the evidence under the good-faith exception to the Fourth Amendment’s exclusionary rule.

The narrow question now before the Supreme Court is whether geofence warrants themselves violate the Fourth Amendment.

The Fourth Amendment Framework

The constitutional analysis is anchored in two competing doctrines. First, the reasonable expectation of privacy. Under Katz v. United States and its progeny, a search occurs when the government intrudes upon a reasonable expectation of privacy. In Carpenter v. united States (2018), the Court held that individuals have a protected privacy interest in historical cell-site location information (CSLI), requiring a warrant for its acquisition.

The second doctrine is the third-party doctrine, under which information voluntarily disclosed to third parties—such as banks or phone companies—falls outside Fourth Amendment protection. However, Carpenter significantly limited this doctrine in the context of pervasive digital tracking.

Geofence warrants sit squarely at the intersection of these doctrines. On one hand, users arguably consent to location tracking by enabling services like Google Location History. On the other, the sheer scope and precision of the data resemble the “digital diary” the Court sought to protect in Carpenter.

The Defense Position: A Modern General Warrant

Chatrie’s argument is straightforward: geofence warrants are constitutionally indistinguishable from general warrants because they lack particularity and probable cause as to any specific individual.

Rather than identifying a suspect, the government searches first and develops suspicion later, a practice the Founders explicitly rejected. Critics emphasize that such warrants can reveal sensitive information about individuals entirely unrelated to the crime, including visits to religious institutions, political gatherings, or medical facilities.

The Government’s Position: A Targeted and Necessary Tool

The government, by contrast, frames geofence warrants as sufficiently particularized. Prosecutors argue that these warrants are limited in time, geography, and subject matter, distinguishing them from indiscriminate searches. They also highlight the practical necessity of such tools in modern policing, particularly where traditional investigative leads are scarce.

Moreover, the government emphasizes user consent, arguing that individuals who opt into location tracking have a diminished expectation of privacy.

Signals from the Justices

Early indications suggest a Court deeply divided, not along simple ideological lines, but around competing visions of digital privacy. Some justices (including Justice Sotomayor) have expressed skepticism about the breadth of geofence warrants and the risk of sweeping in innocent individuals. Others (including Chief Justice Roberts) appear more receptive to law enforcement’s arguments, particularly where warrants are narrowly tailored. Several justices have focused on the role of consent, questioning whether users truly understand the extent of data collection when enabling location services.

What emerges is a Court struggling to translate eighteenth-century constitutional language into a world of ubiquitous digital surveillance.

Conclusion

The Supreme Court’s review of geofence warrants represents a pivotal moment in the evolution of Fourth Amendment jurisprudence. At stake is not merely a single investigative technique, but the broader question of how constitutional protections apply in an era where digital data can reconstruct the most intimate details of our lives.
Whether the Court ultimately reins in geofence warrants or permits their continued use, one point is clear: the line between targeted investigation and mass surveillance is becoming increasingly difficult to draw. And how the Court draws that line in Chatrie will shape the contours of digital privacy for years to come.

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