Supreme Court Examines Fourth Amendment Risks of Geofence Warrants in Landmark Case

In 2016, police in Midlothian, Virginia, requested Google to search its "location history" records for over 500 million users to identify a bank robber. The search narrowed the field to 19 devices near the bank at the time of the crime, which was further reduced to three suspects—including Okello Chatrie, who was ultimately convicted of the robbery.

On Monday, the Supreme Court heard arguments in United States v. Chatrie, a case that highlights the growing tension between law enforcement’s use of geofence warrants and Fourth Amendment protections against unreasonable searches. The outcome could set a precedent for how digital privacy is safeguarded—or compromised—in an era where Americans routinely share vast amounts of personal data with technology companies.

Two Flawed Fourth Amendment Doctrines Under Scrutiny

The case underscores the dangers posed by two longstanding Supreme Court doctrines that have struggled to adapt to the digital age:

• Third-Party Doctrine: Established in 1967, this rule holds that the Fourth Amendment does not apply when individuals voluntarily share information with third parties, such as banks or phone companies. The logic is that once data is handed over, users forfeit any reasonable expectation of privacy.
• Reasonable Expectation of Privacy: The Supreme Court has ruled that the Fourth Amendment only protects information in which individuals have a "reasonable expectation of privacy." However, this standard becomes murky when applied to data collected by apps, cloud services, or other digital platforms.

These doctrines have faced criticism for decades, particularly as technology has evolved. In a 2018 case involving cell-site location data, the Supreme Court ruled that tracking a suspect’s movements generally requires a warrant. However, as Justice Neil Gorsuch noted in his dissent, this conclusion conflicted with the third-party doctrine, leaving unresolved questions about digital privacy.

Geofence Warrants: A New Frontier in Surveillance

Unlike traditional warrants, which target specific individuals or locations, geofence warrants cast a wide net by searching for devices within a geographic area at a specific time. In Chatrie’s case, police obtained such a warrant to identify suspects near the bank during the robbery. His lawyers argue that these warrants violate the Fourth Amendment because they fail to meet the requirements of probable cause and specificity.

The Trump administration, however, contends that geofence inquiries do not require a warrant at all. In its brief, the government argues that users who consent to location tracking have no reasonable expectation that their data will remain private. This position, if upheld, could open the door to warrantless searches of remotely stored emails, photos, calendars, and other digital records.

"The potential for abuse is breathtaking," warned Chatrie’s lawyer, Adam Unikowsky, in a Supreme Court filing. "The same logic would allow the government to search people’s remotely stored emails, photos, calendars, and documents at will."

During oral arguments, several justices expressed alarm at the implications of the government’s stance. Deputy Solicitor General Eric Feigin attempted to reassure the Court that the argument did not extend as far as Unikowsky suggested. Yet the underlying issue remains: If the third-party doctrine applies to location data, it could logically extend to other forms of digital information shared with tech companies.

Why This Case Matters for Digital Privacy

The Supreme Court’s decision in United States v. Chatrie could have far-reaching consequences for privacy rights in the digital age. If the Court sides with the government, it may embolden law enforcement to use geofence warrants—or similar tools—to access vast troves of personal data without stringent oversight. Conversely, a ruling in favor of Chatrie could rein in the use of such warrants and force lawmakers to modernize privacy laws to address the realities of the 21st century.

For now, the case serves as a stark reminder of the challenges posed by rapid technological change. As Justice Sonia Sotomayor noted in a 2012 concurrence, "People reveal a great deal of information about themselves to third parties in the course of carrying out mundane tasks." The question before the Court is whether the Fourth Amendment can—or should—keep pace with these developments.