The Supreme Court has determined that law enforcement's broad geofence warrants, which scoop up smartphone location data from anyone in a targeted area, must comply with Fourth Amendment privacy standards. Justice Elena Kagan authored the majority opinion in a decision that protects citizens from what critics have long called dragnet surveillance.
Geofence warrants allow police and the FBI to compel tech companies to surrender location information for all phones present near a crime scene during a specified window of time, without narrowing the search to specific suspects. The tool has become routine in criminal investigations, but privacy experts warn it opens the door to warrantless monitoring of sensitive locations.
"If the government doesn't need to link something to a crime, it could monitor a protest or an abortion clinic or a gun range or a church or an AA meeting or a doctor's office," said Matthew Tokson, a law professor at the University of Utah.
The case centered on Okello Chatrie, a bank robber who fled Richmond, Virginia, with $195,000 in 2021. Police used a geofence warrant to pull Chatrie's location data from Google. He had enabled the company's optional location history feature, which tracked his position continuously. Chatrie later pleaded guilty and received a 12-year prison sentence.
Chatrie's legal team challenged the warrant as unconstitutionally overbroad, arguing that police had not established probable cause to search the geographic area or the time period they selected. The Fourth Amendment, they contended, requires warrants to be specific and justified by evidence of criminal activity.
Law enforcement defended geofence warrants as essential investigative tools when traditional leads dry up. The federal government countered that people have no reasonable expectation of privacy when voluntarily sharing location data with third-party companies like Google. Officials noted that only about one-third of active Google account holders had actually opted into location history, a figure that still represented more than 500 million users.
Yet Google itself acknowledged in court filings that geofence searches routinely caught innocent parties. The company said such requests frequently captured data from private homes, apartment buildings, government offices, houses of worship, and busy streets, often casting nets far wider than law enforcement had any reason to suspect.
This marks the Supreme Court's first major Fourth Amendment location privacy decision since 2018, when judges ruled 5-4 that police generally need a warrant to access historical cell phone location records. The new ruling goes further by establishing that the scope and specificity of location warrants themselves must meet constitutional limits, not simply that a warrant is required.
Author James Rodriguez: "The court finally acknowledged what privacy advocates have screamed for years: fishing expeditions through millions of people's movements to catch one suspect crosses a constitutional line."
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