United States v. Chatrie: Location Data and the Fourth Amendment
The Supreme Court’s decision in United States v. Chatrie is one of the most important Fourth Amendment cases of the digital era. Although the case arose from the government’s use of a geofence warrant to identify a bank robbery suspect, the Court’s opinion is about something much larger: whether Americans retain a constitutional right to privacy in the vast amounts of location data generated by their cell phones.
The Court answered yes.
In a 6-3 decision, the Court held that when the government compels a technology company to disclose a person’s historical cell phone location information, it conducts a search within the meaning of the Fourth Amendment. The decision does not prohibit geofence warrants, but it makes clear that the Fourth Amendment applies as much in the digital world as it does in the physical one.
What Happened?
The case began with the investigation of a 2019 bank robbery in Virginia.
Unable to identify the robber through traditional investigative methods, police obtained a geofence warrant directing Google to search its location history database. Rather than identifying a known suspect, the warrant required Google to determine which devices had been within a specified geographic area around the bank during the relevant time period.
Google first produced anonymized location records for devices in the area. Investigators then narrowed the list and eventually requested identifying information for several users. One of those users was Okello Chatrie, who was later charged with the robbery.
The Legal Question
The constitutional question before the Court was not simply whether geofence warrants are permissible.
Instead, the Court confronted a more fundamental issue:
Does a person lose Fourth Amendment protection simply because a third-party company stores detailed records of that person’s movements?
The government argued that users voluntarily shared their location information with Google and therefore had no reasonable expectation of privacy under the so-called third-party doctrine.
Chatrie argued that modern location history is fundamentally different. Smartphones generate an extraordinarily detailed record of where people live, work, travel, worship, receive medical care, and spend their daily lives. Simply carrying a smartphone should not mean surrendering constitutional protection.
The Supreme Court’s Decision
The Supreme Court agreed that obtaining this type of historical location information constitutes a Fourth Amendment search.
The Court emphasized that modern cell phones are not optional conveniences. They have become an indispensable part of everyday life, continuously generating precise location information as people go about their daily routines. Because participation in modern society effectively requires carrying such devices, the Court rejected the notion that users meaningfully “volunteer” this information simply because it resides on Google’s servers.
In other words, the constitutional protection follows the individual, not the storage location of the data.
At the same time, the Court stopped short of declaring the warrant in this case unconstitutional. Instead, it sent the case back to the lower courts to determine whether this particular geofence warrant satisfied the Fourth Amendment’s traditional requirements of probable cause and particularity.
Why the Decision Matters
Although Chatrie arose from a geofence warrant, the Court’s reasoning reaches much further.
The opinion reflects a growing recognition that digital location data reveals the “privacies of life” in ways that would have been unimaginable when the Fourth Amendment was written. A person’s location history can expose intimate details about family relationships, political activities, religious practices, medical treatment, and countless other aspects of everyday life.
The Court recognized that these constitutional protections cannot depend on whether the information happens to be stored by Google, Apple, a wireless carrier, or another technology company. The Fourth Amendment protects people, not merely physical places or paper records.
That principle may prove to be the decision’s most enduring legacy.
Looking Ahead
The Court did not prohibit geofence warrants. Instead, it held that they are constitutional searches, meaning they must satisfy the ordinary requirements of the Fourth Amendment.
Future courts will now have to determine what those requirements mean in practice. How specific must investigators be? When is probable cause sufficient? How broad may a warrant become before it resembles the general warrants the Fourth Amendment was designed to prevent?
Those questions extend well beyond criminal investigations.
AI systems increasingly rely on enormous collections of behavioral data - where we go, what we search for, what we buy, who we communicate with, and how our devices move through the world. The constitutional question is no longer simply whether the government can obtain that data. Increasingly, it is whether constitutional protections should weaken merely because private companies collect it first.
Chatrie suggests the answer is no.