Federal judge rules a warrantless Flock plate search unconstitutional mass surveillance

On Oct. 1, 2026, a federal judge in Tulsa threw out evidence from a Flock automated license-plate search after a deputy queried a California plate’s month-long travel history without a warrant — calling the network a form of indiscriminate mass surveillance.

Flock’s pitch has been that plate hits in public are not a Fourth Amendment search. A federal judge just said a month of network hits can be — and suppressed the stop that followed. That is a concrete legal crack in warrantless ALPR dragnets, even if it is one district case on specific facts.

On Thursday, 1 October 2026, U.S. District Judge Sara E. Hill issued an Opinion and Order in the Northern District of Oklahoma. The case is United States v. Melisa Susan Kyle, Case No. 26-CR-00189-SEH. The paper is Document 62. The line at the top of each page says it was filed in that court on 10/01/26. The signature dates the order the 1st day of October, 2026. The order grants Kyle’s opposed motion to suppress. A motion to suppress is a request to keep evidence out of the case. The court says it held a hearing, heard witnesses, and admitted exhibits before it ruled. Those lines are the order.

Who ran the search. Tulsa County Deputy Sheriff Freddie Alaniz investigates crimes on the highways in and around Tulsa. The order says he has experience in drug interdiction, has served as a task force officer with the federal Drug Enforcement Administration, and is certified as a narcotics K-9 officer. A K-9 officer works with a police dog. His patrol car has cameras that read the license plates of cars that pass him. Those cameras feed networks that log a plate with the date, time, and place it was seen. That technology is an automated license-plate reader, often shortened to ALPR. Alaniz had access to at least two of those systems, Flock and VehicleManager. The order says they do the same job: gather and organize a vehicle’s history on public roads for police across the country. At the time of this stop, he could see at least 30 days of location information in many states. He did not have Flock data from California. Those lines are the order.

What he did with the California plate. One evening he parked beside the highway to watch traffic. He saw a Mazda SUV with a California plate. The camera on his car picked the plate up. The order says he then pulled onto the highway to follow the Mazda “for no apparent reason other than the fact that it had a California license plate,” and that he ran a query on the Flock system for that plate. Both Flock and VehicleManager ask for a reason. He typed “traffic violation” and “investigation.” At the time of those queries, the order says, all he knew was that the vehicle had a California plate. Those lines are the order.

What the history showed, and how the stop started. After the query, he saw the Mazda had gone from Locust Grove, Oklahoma, toward the California and Arizona border, and was heading back toward Missouri after a short trip. He testified that the car was in the California area for about one day. The order says that timing is somewhat unclear, in part because he did not have California Flock data, and that the time in California was short compared with the drive from Missouri and back. He believed he saw two traffic violations: a lane change without a signal at least 100 feet before the move, and following another car too closely, with about 30 feet between them. The court found the stop was justified at the start, because of the following distance. After he gave Kyle a warning and returned her license, he kept her there for a drug investigation. She refused consent to a search. His dog sniffed the car, alerted, and officers searched it. The search led to her arrest. The order does not print a drug weight. Those lines are the order.

What 404 Media reported about the search of the car. Jason Koebler’s story, stamped Oct. 2, 2026, 4:49 p.m., says Alaniz used Kyle’s travel history as part of the reason to search the car, and that officers found 91 pounds of methamphetamine. Methamphetamine is a stimulant drug. That weight is 404 Media’s account of what the search found. It is 404 Media summarizing the case. The order itself says the search of the vehicle resulted in her arrest, and that the evidence from that search is suppressed. It does not print 91 pounds.

The Fourth Amendment holding. One section of the order is titled “Alaniz’s use of the ALPR Systems was an Unconstitutional Warrantless Search.” The Fourth Amendment is the rule that the government usually needs a warrant before it searches, and that a warrant needs probable cause. Probable cause means enough facts for a reasonable officer to believe a crime is underway. Hill wrote that the plate-history search “was not supported by probable cause, and it was done without a warrant in violation of Kyle’s Fourth Amendment rights.” She wrote that, on this record, the only reason he ran that search was that he saw a California plate. Those lines are the order.

How much history the query returned. Hill wrote that the search in the ALPR system “provided him with more than 50 individual records of Kyle’s whereabouts across the country for an entire month.” She found that searching that history intruded on Kyle’s reasonable expectation of privacy in the whole of her physical movements, so it counted as a search under the Fourth Amendment. A reasonable expectation of privacy is the idea that people, and the law, treat something as private even when a person is out on a public road for a moment. The “whole of” her movements means the month of travel taken together, not one camera seeing one car go by. Those lines are the order.

Why older road-tracking cases do not settle it, in the order’s words. In United States v. Knotts, in 1983, the Supreme Court said a person traveling by car on public roads has no reasonable expectation of privacy in movements from one place to another. Hill wrote that those words belong to the facts of that case. Knotts, she wrote, was not “a large-scale, dragnet-type surveillance system like the ALPR technology in this case.” A dragnet, in that phrase, is a sweep that gathers everyone who passes, not a follow of one suspect. She wrote that the systems here are “approaching the dragnet type law enforcement practice” that case had warned about. She also wrote: “This is a type of indiscriminate mass surveillance.” Indiscriminate means it is not aimed at one person in advance. The order says the tool collects information about vehicles that pass a camera on the network, and serves that history to police on demand. Those lines are the order.

What the court threw out. The order says Alaniz began following the car while he ran the ALPR search, so that search is tied to the rest of the stop. It says all evidence obtained after he started the ALPR search must be suppressed, as fruit of the poisonous tree. That phrase means evidence that grew out of an illegal step stays out, not only the step itself. Separately, the court found that extending the stop after the license was returned was unlawful, because the government did not show a specific reason to think the trip was a crime rather than ordinary travel, and that evidence from that extension is out too. The last page orders that the motion to suppress is granted. Those lines are the order. 404 Media reports that Hill ordered the Flock evidence and the evidence from the vehicle search thrown out. That is 404 Media’s summary of the same ruling.

What Flock told 404 Media. A Flock spokesperson said the company was not a party to the case. The spokesperson said the ruling “goes against the overwhelming weight of authority in similar cases across the country, including multiple recent decisions in Oklahoma,” and that Flock expects an appeal and expects the ruling to be overturned. The spokesperson said the ruling “is limited to the specific facts of this case,” that it “does not set controlling precedent,” and that it does not affect agencies’ continued use of the technology. Controlling precedent would be a decision other courts have to follow. Those sentences are the spokesperson’s, as 404 Media prints them. They are the company’s response. They are not the court’s. 404 Media also writes that Hill’s decision will not set a binding precedent. That sentence is 404 Media’s.

What The Washington Post reported the same day. The Post’s story, “A police search using Flock was a form of ‘mass surveillance,’ judge rules,” is dated October 2, 2026, 7:37 p.m. Eastern. It says a federal judge in Oklahoma said a police search of Flock amounted to “indiscriminate mass surveillance,” and that police conducted an “unconstitutional warrantless search” by using Flock cameras to reconstruct a woman’s travels without probable cause. Those lines are the Post’s report of the order.

The picture is the first page of that Opinion and Order. A white court page sits on a dark field. The header reads Case 4:26-cr-00189-SEH, Document 62, filed in USDC ND/OK on 10/01/26, page 1 of 38. The caption names the United States and Melisa Susan Kyle, Case No. 26-CR-00189-SEH, and the title Opinion and Order. The opening paragraph says the court grants the motion to suppress. A line under the page reads U.S. v. Kyle, Opinion and Order, ND Oklahoma, filed Oct. 1, 2026. It is the first page of the order. It is not a photograph of the deputy, the car, or the cameras.

In plain terms, Judge Sara E. Hill on Oct. 1 granted Melisa Kyle’s motion to suppress in a Tulsa drug case. A deputy followed her rented Mazda because it had a California plate and pulled a month of license-plate history, more than 50 hits, without a warrant. The judge called that kind of network indiscriminate mass surveillance and a Fourth Amendment search, and she kept out the evidence that followed the search, including the search of the car. The court also said the traffic stop was allowed at the start, for following another car too closely, and that holding Kyle after the warning was not. 404 Media reported that the car held 91 pounds of methamphetamine. Flock told 404 Media it was not in the case, that this order is limited to these facts, that it does not control other courts, and that the company expects an appeal.