Federal Judge: Warrantless Flock License Plate Search Was 'Indiscriminate Mass Surveillance'
A federal judge has ruled that a law enforcement officer’s warrantless search of Flock Safety’s nationwide license plate reader database was unconstitutional — calling it “a type of indiscriminate mass surveillance” that required a warrant the deputy never obtained.
Judge Sara Hill found that the deputy had “no apparent reason” for querying the database other than the fact that the vehicle in question had a California license plate. The ruling, reported by TechCrunch, 404 Media, and TechSpot, breaks from how prior courts have treated Flock’s technology — which has typically been treated as equivalent to a single officer observing a plate in public, rather than as a searchable surveillance network.
What the Ruling Said
Hill’s language is notable for what it describes Flock’s network as, rather than just what it found in this specific case. The ruling characterizes Flock’s nationwide camera grid as approaching “dragnet-type law enforcement practice” — a legal concept with Fourth Amendment significance. A dragnet search sweeps up data on many people in the hope of catching one; constitutional doctrine has historically been skeptical of such approaches.
The specific facts here were thin from the government’s side. A deputy queried Flock’s database for a vehicle. The vehicle was registered in California. That was the search trigger. Hill found that without individualized suspicion, running that search was a constitutional violation requiring suppression of the resulting evidence.
The Network
Flock Safety is a private company that sells automated license plate readers to law enforcement agencies. Its cameras are deployed across the United States and record vehicle location data that officers can search retroactively — across multiple jurisdictions, across time. The company markets the network’s coverage as a feature: one query can pull sightings from thousands of cameras nationwide.
That scale is exactly what the Hill ruling is concerned about. An officer observing a plate in person is a point-in-time interaction with no automated search capability and no permanent record. An officer querying Flock can reconstruct a vehicle’s movements across cities and weeks. The constitutional framework for those two activities is not the same, even though they involve the same information — a license plate number.
The Legislative Response
The day after the ruling, Representatives Alexandria Ocasio-Cortez and Senator Bernie Sanders, along with co-sponsor Senator Jeff Merkley, introduced legislation targeting automated license plate reader networks. The bill, framed as a response to surveillance infrastructure that has expanded faster than any legal framework, would prohibit federal agencies from using ALPR systems or accessing their data and would block federal grant funding to state and local governments that use them, with statutory exceptions for toll collection. It does not ban private use of the cameras outright.
Flock’s cameras are now present in thousands of jurisdictions that independently contracted with the company, with no uniform federal oversight of the aggregate database or how it is queried.
Why the Ruling Matters
Flock has argued, successfully in other courts, that its cameras are simply an automated version of an officer watching traffic. Hill’s ruling rejects that framing at the network level. A single camera is arguably like an officer on a corner. A searchable national database that can reconstruct months of a vehicle’s movements is something else.
The legal question — whether the Fourth Amendment’s third-party doctrine, which generally allows warrantless access to records shared with others, extends to a commercial surveillance network that law enforcement agencies have effectively nationalized by subscribing to it — has not been definitively resolved. Hill’s ruling puts a significant marker on one side of that debate.
Flock is a private vendor and not a party to the underlying criminal case, so it does not have standing to appeal. The decision to appeal rests with federal prosecutors. Flock publicly stated it disagrees with the ruling and expects the government to appeal.