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May 7, 2026 — A woman in her twenties from Northern Virginia says an officer pulled her over during a September 2025 road trip and told her a license plate scanner had flagged “suspicious travel patterns.” The ACLU says he also told her he was with the FBI and then showed her a map on a police computer.
The account, posted Oct. 26 by ACLU policy analyst Jay Stanley, is short on agency details but long on legal implications. It raises a question that has been building for years: when an algorithm spots an unusual route, can a traffic stop rest on something as ordinary as lingering in the left lane?
The woman told the ACLU she was traveling through Oregon, Texas, and Louisiana and was driving from New Orleans toward Florida when an officer waved her over. His stated reason: she had stayed in the left lane too long. She says she was driving at a normal speed.
At the shoulder, the officer asked where she had been and where she was headed. She handed him a pamphlet from a whiskey museum as proof she had been in New Orleans. He replied that plate scans showed no hits in New Orleans and that he believed she was lying, according to the ACLU account.
Then he asked her into his patrol car. On the screen was mapping software with a map of the United States. When he clicked a point on the map, a photo of her license plate appeared. She asked how he could see her plate. Her memory of his answer: the cameras are just about everywhere.
The ACLU does not name the officer, his agency, the state, the road, or the software on his screen. It also does not say whether she was ticketed, searched, or held for any length of time. Nothing in the post establishes that the officer was actually an FBI agent.
The post points readers to Flock Safety’s AI features, but it does not say that a Flock product was used, that an automated alert triggered the stop, or that the officer looked up her plate himself after pulling her over. As of this writing, the woman’s account has not been independently confirmed through a court filing or other public record.
The legal framework starts with the Supreme Court’s 1996 decision in Whren v. United States. If an officer has probable cause to believe any traffic law was broken, the stop is lawful — even if the real reason has nothing to do with driving.
That makes a left-lane violation a convenient door. Many states require drivers to move right unless they are passing, and the question of “too long” is left to the officer’s judgment. A hunch from plate data never has to be stated or tested, because the lane violation gives the stop its legal footing.
A second Supreme Court case, Rodriguez v. United States (2015), puts a limit on that door. An officer cannot extend a stop beyond the time needed to handle the traffic violation unless there is independent reason to suspect criminal activity.
In Rodriguez, the Court ruled that a dog sniff after a traffic stop was completed violated that rule. But whether a few questions about a road trip count as a meaningful extension is a case-by-case question. Lower courts have drawn the line differently depending on the jurisdiction.
A road trip is not a traffic violation. The ACLU’s argument is that a travel pattern, with no known investigation attached to it, is not a sound basis for holding someone. No court has been asked to rule on this particular stop, so the issue remains open.
The Supreme Court’s closest signal is Carpenter v. United States (2018), which said police generally need a warrant for prolonged access to cell-site location records. The Court stressed how much location history reveals about daily life. But it limited that ruling to cell phone data, and courts have not settled whether the same logic applies to license plate readers.
Automated license plate recognition is not new. Toll booths, parking garages, and police cruisers have used it for years. What is newer is the effort to turn raw plate scans into travel-pattern intelligence.
The ACLU says Flock Safety promoted AI in July 2025 that could alert police to drivers with suspicious movement patterns and track which vehicles are often seen together. Wired later reported on files describing a newer system that accepts open-ended queries across plate data, arrest records, case files, and data-broker databases. The ACLU’s post does not include a response from Flock.
Federal agencies have described similar capabilities. The Associated Press reported in November 2025 that Border Patrol builds a “pattern of life” for scanned vehicles, hid some cameras inside construction barrels, and in some cases alerted local police to stop drivers based only on algorithmic analysis. Customs and Border Protection told the AP that it uses plate readers under a multi-layered policy framework and does not disclose operational uses for national security reasons.
The ACLU pairs the Virginia woman’s account with several other examples of travel-pattern policing.
In Texas, a Bexar County deputy stopped Alek Schott on Interstate 35 in March 2022 and held him for 76 minutes. A federal jury in the fall of 2025 found the county liable and awarded Schott $76 — one dollar per minute. The ACLU says dashcam video contradicted the deputy’s claim that Schott crossed a lane line, and that a federal fusion center had tipped local police off about his round trip between Houston and Carrizo Springs.
In Wisconsin, the ACLU says police noted that Michigan was “a known source State for Marijuana as it is legal there” while targeting a man who drove between Michigan and Wisconsin in April 2025. In California, a grandmother crossing the border was questioned by CBP officers about how much time she spent at casinos and was told, “It just seems suspicious,” according to a March 2026 report by The Markup. The Wisconsin and California accounts in the ACLU post do not include an outcome.
For the Virginia driver, the ACLU post points to no complaint, lawsuit, or court date. The account is the whole record for now.
The rules for plate data itself are being written elsewhere. Churches have asked the Wisconsin Supreme Court to require a warrant before police search plate-reader data in Milwaukee, Green Bay, Racine, and Kenosha. Rhode Island’s model policy allows 30 days of plate data to be kept.
Under Rodriguez, the clock is the measure at any stop: the encounter lasts as long as the lane violation takes to resolve unless the officer can name a reason to hold the car longer. The harder question is what counts as a reason.
Say software flags your route as odd, and all you did was linger in the left lane. Should the officer have to say that is why he pulled you over?
