Following the Supreme Court ruling in Chatrie v. United States, which said that a geofence search required a judicial warrant, a judge has ruled that tower dumps warrants are unconstitutional.
Five weeks after the Supreme Court struck down so-called geofence searches in its landmark Fourth Amendment decision in Chatrie v. United States, the ramifications for other broad law enforcement investigative techniques are coming into focus. On Wednesday, August 5, U.S. District Judge Carlton Reeves reaffirmed a magistrate judge’s ruling quashing federal law enforcement’s ability to obtain “tower dump” warrants.
Judge Reeves’ decision in the Southern District of Mississippi may signal a turning point in the post-Chatrie era against non individualized electronic searches. Both state and federal law enforcement authorities have commonly used tower dumps to pull large amounts of data from cell towers located near crime scenes. The data, which reveals the cell phones connected to a cell tower during a set time block, has historically allowed investigators to examine recurring cell numbers at multiple crime scenes.
Last year, investigators with the Bureau of Alcohol, Tobacco, Firearms and Explosives successfully used a tower dump to identify a man accused of a string of gun store robberies in Pennsylvania. This year, investigators asked a federal judge for approval to perform a tower dump while investigating vandalism at a Federal Aviation Administration facility in Vermont.
In the Mississippi case, FBI agents investigating a series of violent crimes committed in the Jackson area submitted four warrants for a magistrate judge’s approval in February 2025. The magistrate judge, however, denied the warrants, citing the U.S. Court of Appeals for the Fifth Circuit’s decision in United States v. Smith, pre-dating Chatrie, striking down geofence warrants. In March 2025, the government appealed the magistrate judge’s order to Judge Reeves.
This is the sort of search that the founders specifically opposed.
These were called, "General Warrants," or, "Writs of Assistance."
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