US courts diverge on warrantless searches of license-plate databases

Two rulings issued on consecutive days in the United States reached opposite conclusions about police access to automated license plate reader databases. On October 1, 2026, U.S. District Judge Sara E. Hill of the Northern District of Oklahoma held that a warrantless historical query violated the Fourth Amendment in the criminal case United States v. Kyle. The next day, Santa Clara County Superior Court Judge Jeffrey B. El-Hajj dismissed a civil lawsuit challenging the use of similar technology by the city of San Jose, California.

The decisions do not create a nationwide rule, and the cases are not exact counterparts. One arose from a motion to suppress evidence in a federal criminal prosecution; the other considered at the pleading stage whether a complaint under the California Constitution could proceed. Even so, the contrast exposes a central dispute: does capturing a plate visible on a public road remain a discrete observation, or does it become intrusive surveillance when thousands of observations are aggregated and searchable?

What the Oklahoma court decided

According to the court order, an officer queried systems operated by Flock Safety and the VehicleManager platform after noticing that the vehicle had California plates. The search was not supported by a warrant or probable cause and returned more than 50 records covering roughly one month in locations across the country. Judge Hill concluded that the resulting collection could reconstruct historical movements on a scale sufficient to create a reasonable expectation of privacy.

The order described the network as a form of mass surveillance and suppressed the evidence obtained after the query. The court separately found that the traffic stop had been improperly prolonged. The decision is notable because the order itself acknowledged that neither the U.S. Supreme Court nor the Tenth Circuit had directly decided whether this kind of database query constitutes a Fourth Amendment search.

Flock was not a party to the case. In a statement reported by The Washington Post, a company spokesperson said the ruling conflicts with most existing authority and expressed an expectation that it would be appealed. That is the company’s position, not a judicial finding.

Why the California case ended differently

In California, organizations represented by the Electronic Frontier Foundation and the ACLU challenged San Jose’s access to a license plate reader network. According to the plaintiffs, the city operates nearly 500 cameras, generates millions of records each month and retains data for as long as a year. Those figures are allegations advanced by the challengers, not findings reached after a trial.

Judge El-Hajj sustained the city’s demurrer to all three causes of action without leave to amend. The order said the court was bound by the state appellate decision in People v. Cartwright, which found no reasonable expectation of privacy in plates captured by cameras on public roads or in later database queries. The EFF has said it plans to appeal.

What the two decisions actually change

The Oklahoma ruling applies directly to that federal prosecution and may be reviewed on appeal; it does not bind courts nationwide. The California order is also a trial-court decision and applies state precedent to a specific civil lawsuit. Describing license plate readers as either “banned” or broadly “approved” across the United States would therefore go beyond what the documents establish.

The wider consequence is an editorial inference from the contrast: the legal debate is shifting from the act of photographing a plate to the ability to search accumulated journeys. When a system turns scattered public observations into a nationwide history of movement, scale, retention time and searchability may matter as much as the place where each image was captured. Until higher courts set clearer rules, local policies, retention limits and warrant requirements will remain crucial in determining how these networks are used.