A report this week from Wired — picked up broadly across hackernews — details that federal investigators obtained court-approved warrants specifically authorizing the use of IMSI catchers, commonly called "stingrays," to locate a producer associated with journalist Don Lemon. The warrants, which Wired reviewed, represent a documented instance of the federal government going through the judicial process to deploy the devices rather than using them covertly without oversight — a distinction that has been the subject of years of legal and civil liberties litigation.
IMSI catchers work by broadcasting a signal that causes nearby mobile phones to identify themselves and connect to the fake tower as though it were a legitimate carrier cell site. The device then captures the phone's unique IMSI number and real-time location data. Law enforcement agencies at the federal, state, and local level have possessed these devices for well over a decade; a 2015 count by the American Civil Liberties Union identified at least 72 agencies across 24 states with stingray equipment, a number that has only grown since. The FBI has had internal policies requiring warrants for stingray use since 2015, and the Department of Justice formalized that requirement agency-wide that same year — meaning the warrant process Wired documented is consistent with those standing rules rather than an anomaly.
The case is notable precisely because the target had a direct professional relationship with a prominent media figure. Courts have not carved out categorical protections for journalists' associates under the Fourth Amendment, and the warrant standard for IMSI catcher use — probable cause — is the same standard applied to physical searches. Wired's reporting does not indicate the warrants were successfully challenged before execution.
What most general-interest coverage of this story will skip is the physical reality of how IMSI catchers operate in practice: the devices are not surgical. A stingray deployed in an urban block, apartment complex, or campground captures the IMSI numbers of every phone within range — not just the target's — before the operator filters down to the device of interest. That incidental collection has been acknowledged by the DOJ itself in guidance documents, and it means that geographic proximity to a target of federal interest generates passive data exposure for bystanders, a fact with direct relevance to anyone who thinks about operational security or simply keeps a phone in their pocket. Our earlier technical breakdown of how IMSI catchers interact with modern LTE and 5G networks covers the hardware side of why the "just use a newer phone" assumption doesn't fully hold.
