Skip to main content
NOPE
Medium reported severity Lawsuit Settled

Atherton, California: police stopped a driver at gunpoint in April 2021 and made him lie on his stomach to be handcuffed after a license-plate reader misread the letter H on his dirty plate as M and matched it to a stolen car; the town settled his lawsuit for $45,000 in 2023

At about 5:30 a.m. on 16 April 2021, according to a lawsuit reported by The Almanac, an automated license-plate reader in Atherton, California, misread the dirt-obscured plate of a driver's car, reading its letter H as M, and matched it to a reported stolen vehicle. Atherton police followed the car for several minutes without visually verifying the plate, then made a high-risk felony stop, ordering him at gunpoint to throw his keys out of the window, get out and lie on his stomach to be handcuffed. He sued three officers in 2022 for unreasonable seizure and excessive force; the officers denied the allegations and the injuries he claimed, and the case was settled on 16 March 2023 for $45,000. Business Insider, citing police records, reported in March 2026 that the misread came from a Flock camera and that officers noted the Flock cameras had misread the plate; an Atherton police commander said the plate was obstructed by dirt and that the town denies wrongdoing.

AI system
Flock Safety license plate readers (reported)
Flock Safety
Occurred
16 Apr 2021
Reported
12 February 2024
Event location
United States
What the AI did
Made a claim about the person
Reported harm
Loss of Liberty
Whose AI use
An institution’s AI use
Setting
Justice
Evidence
AI involvement supported · Causal attribution supported · 2 sources
4 claims: 2 corroborated, 2 reported. 3 open questions
People reported harmed
1 person

AI system as recorded: Automated license-plate-reader camera in Atherton, California, identified by Business Insider from police records as a Flock Safety camera (which it describes as one of Flock's AI cameras), that misread the plate and matched it to a stolen-vehicle record

What Happened

The Almanac (12 February 2024), reporting a 2022 lawsuit while covering a later case involving one of the same officers: at about 5:30 a.m. on 16 April 2021 an automatic license-plate reader misread the driver's dirt-obscured plate, reading its H characters as M, and matched it to a reported stolen vehicle. According to the suit, Atherton police followed the vehicle for several minutes but failed to visually verify what the reader had captured, then, believing they were making a high-risk felony stop, ordered him at gunpoint to throw his keys out of the window, get out of the car and lie on his stomach to be handcuffed. The suit argued that ALPR false positives have long been known and that accepted standards require visual verification before acting on a hit. The officers denied the allegations and the injuries claimed, and the department argued that he had waited too long to make claims. The case was settled on 16 March 2023 for $45,000. Business Insider (9 March 2026), citing police records, reports that the Flock camera confused an H for an M and that officers noted 'the Flock cameras misread' the plate; Atherton Police Commander Dan Larsen told Business Insider that dirt obstructed the plate and that the town denies wrongdoing and contends it acted lawfully.

Reported harm

He was stopped at gunpoint, made to lie on his stomach and handcuffed after a misread license-plate alert, and his lawsuit claimed injuries that the officers deny (The Almanac; Business Insider). The town settled for $45,000 while denying wrongdoing.

Outcome

Resolved

He sued three Atherton police officers on 2 October 2022 for unreasonable seizure and excessive force; the officers denied the allegations and the claimed injuries. The case was settled on 16 March 2023 for $45,000, with a release of claims (The Almanac, citing court records and the settlement agreement). Atherton denies wrongdoing (Business Insider).

What remains unknown

  • The court and case number of the 2022 lawsuit; the complaint was not read.
  • The injuries he claimed; The Almanac says only that the officers denied them.
  • Whether The Almanac's unnamed automatic license-plate reader and Business Insider's Flock camera are the same device; Business Insider cites police records for the Flock identification.

What the evidence supports

AI involvement: supported. The lawsuit (The Almanac) says an automatic license-plate reader misread the dirt-obscured plate and matched it to a stolen vehicle; Business Insider, citing police records, identifies the camera as Flock's, reports that it confused an H for an M and that officers noted the Flock cameras misread the plate, and describes the cameras as AI cameras. The plate match against a stolen-vehicle record is the automated system's claim about his car; following without visual verification and the armed stop were officers' decisions.

4 claims: 2 corroborated, 2 reported. What the statuses mean

Corroborated In April 2021 Atherton police stopped the driver at gunpoint, made him lie on the ground and handcuffed him.

Causal attribution. The lawsuit as reported by The Almanac and police records as reported by Business Insider.

  • almanacnews.com(opens in new tab) supports · English
    'At about 5:30 a.m. on April 16, 2021, an automatic license plate reader (ALPR) had misread'; 'over and ordered him at gunpoint to throw his keys out of the window, get out of the car, and lie on his stomach to be handcuffed.'
  • businessinsider.com(opens in new tab) supports · English
    'was stopped by local police at gunpoint, instructed to lie on the ground, and handcuffed.'
Corroborated The license-plate reader misread the letter H on his dirt-obscured plate as M.

Causal attribution. The driver's lawsuit (The Almanac) and police records and an Atherton police commander (Business Insider) agree on the misread and the dirt.

  • almanacnews.com(opens in new tab) supports · English
    'caused the ALPR to read the “H’s” of the license plate as “M’s.”'
  • businessinsider.com(opens in new tab) supports · English
    'Police records show that the Flock camera confused an "H" for an "M"; officers noted that "the Flock cameras misread" the plate.'; 'The license plate in question was obstructed by dirt, causing one of the letters (H) to look like an M,'
Reported He sued three officers for unreasonable seizure and excessive force; the officers denied the allegations and the injuries claimed, and the case was settled on 16 March 2023 for $45,000, with the town denying wrongdoing.

Causal attribution. Court records and the settlement agreement as reported by The Almanac; Business Insider reports the same settlement amount and the town's denial.

  • almanacnews.com(opens in new tab) supports · English
    'Records show that the case was settled on March 16, 2023, for $45,000.'; 'the Atherton police officers denied all allegations, as well as the injuries that'
  • businessinsider.com(opens in new tab) supports · English
    'filed a lawsuit and settled with the town and police officers for $45,000.'; 'denies any wrongdoing and contends that it acted properly and lawfully.'
Reported According to the suit, the reader matched the plate to a reported stolen vehicle, and officers followed the car for several minutes without visually verifying the plate before making what they believed was a high-risk felony stop.

Causal attribution. The driver's lawsuit as reported by The Almanac.

  • almanacnews.com(opens in new tab) supports · English
    'matched them to the ones of a reported stolen vehicle.'; 'Atherton police followed the vehicle for several minutes but failed to visually verify what the ALPR had falsely captured, according to the suit.'; 'With the belief that they were pursuing a “high-risk felony stop,”'

Sources

2 sources inspected. Sources that repeat one account do not corroborate each other.

How the sources were read, and where the events happened

Read on 2026-10-04 from the Internet Archive 2026 capture (The Almanac, 12 February 2024, updated 16 February 2024); the live site returned HTTP 429. Draws on the amended complaint, the officers' answer and the settlement agreement. Applies to s1.

Read live on 2026-10-04 (Business Insider, 9 March 2026); full text present in the served page. Cites police records and an Atherton police commander. Applies to s2.

Event countries: United States. Affected-person countries: United States. Court countries: United States.

The stop was made by Atherton, California, police (The Almanac; Business Insider), and the suit was brought against Atherton officers and settled with the town. The court is not named in the bodies read; US rests on the suit against a California town's officers.

Reviewed for publication 2026-10-04: Published under the 2026-09-15 charter as an institutional-use case consistent with the held Flock misread rows: the driver's lawsuit (The Almanac) and police records (Business Insider) describe a license-plate-reader misread that led Atherton officers to stop and handcuff him at gunpoint; the town settled for $45,000 while denying wrongdoing. He is not named here.

People described

An adult driver stopped in Atherton, California (named as the plaintiff in his own lawsuit; not named here)

People reported harmed in this case

1 person

0 AI participants · 1 other person harmed

One person, the driver, stopped at gunpoint and handcuffed (The Almanac; Business Insider). Exact 1.

Counted once within this case. The same person may appear in other cases. This count does not establish AI causation.

Tags

#flock#alpr#license-plate-reader#misread#wrongful-stop#gunpoint#california#atherton#justice#settlement

Cite this case

Compiled per our published methodology: verification statuses, sourcing standards, and corrections process.

APA

NOPE. (2026). Atherton, California: police stopped a driver at gunpoint in April 2021 and made him lie on his stomach to be handcuffed after a license-plate reader misread the letter H on his dirty plate as M and matched it to a stolen car; the town settled his lawsuit for $45,000 in 2023. AI incidents. https://nope.net/incidents/2021-atherton-california-flock-alpr-misread-plate-gunpoint-stop-lawsuit-settled

BibTeX

@misc{2021_atherton_california_flock_alpr_misread_plate_gunpoint_stop_lawsuit_settled,
  title = {Atherton, California: police stopped a driver at gunpoint in April 2021 and made him lie on his stomach to be handcuffed after a license-plate reader misread the letter H on his dirty plate as M and matched it to a stolen car; the town settled his lawsuit for \$45,000 in 2023},
  author = {NOPE},
  year = {2026},
  howpublished = {AI incidents},
  url = {https://nope.net/incidents/2021-atherton-california-flock-alpr-misread-plate-gunpoint-stop-lawsuit-settled}
}

Related cases

Medium Flock Safety license plate readers

Tulsa County, Oklahoma: a federal judge ruled on 1 October 2026 that a sheriff's deputy's warrantless search of a driver's month-long location history in the Flock and VehicleManager licence-plate-reader systems, run because her car had California plates, violated her Fourth Amendment rights, and suppressed all evidence obtained after the search; she had been held in pretrial detention since May

In an opinion and order of 1 October 2026 in a federal drug prosecution in the Northern District of Oklahoma, Judge Sara E. Hill found that a Tulsa County deputy sheriff followed a driver's car on the highway for no apparent reason other than its California licence plate and queried it in the Flock and VehicleManager automated licence plate reader (ALPR) systems, which 404 Media describes as an AI-powered surveillance system. The court found that the search returned more than 50 records of her whereabouts across the country over a month, that it was a warrantless search without probable cause in violation of her Fourth Amendment rights, and that all evidence obtained after the deputy began the ALPR search must be suppressed. The deputy had stopped her for a lane change, detained her for a dog sniff after she refused consent, and searched the car; 404 Media reports that he found 91 pounds of methamphetamine. The docket shows she was ordered detained pending trial in May 2026. After the ruling her lawyer asked the court to revoke the detention order, saying the evidence relied on to detain her is inadmissible. Flock told 404 Media it expects the ruling to be appealed.

Medium Flock Safety license plate readers

Sherwood, Arkansas: a driver and passenger with a one-month-old child are detained after an officer draws his weapon because a Flock camera misread their plate by one letter as a stolen vehicle's

KATV reported on 18 March 2026 that in February a Flock license-plate-reader camera in Sherwood, Arkansas flagged a black Chevrolet Tahoe as stolen. An officer stopped the car in a Kohl's parking lot, drew his weapon and detained the driver; a second officer arrived and the passenger, who was in the back seat next to a one-month-old child, was also detained. According to the incident report, the plate the camera matched belonged to the stolen vehicle in its system and the stopped car was a different vehicle: the camera's read was off by one letter. The officers released both people once they realized the mistake. After the incident the Sherwood Police Department set up a Flock transparency portal.

High Flock Safety license plate readers

San Diego: three men are arrested after police treat a Flock license-plate-reader photo of a red Alfa Romeo, taken five miles from where officers had just tried to stop the suspect car, as a hit; one spends nearly a month in jail before charges are dropped

Times of San Diego reported on 7 June 2026, from police reports and tort claims, that on 26 November 2025 San Diego police pursued a red Alfa Romeo after an attempted carjacking in Golden Hill but did not get its plate. A Flock automated license plate reader in Old Town, five miles away, captured a photo of a red Alfa Romeo 23 seconds after the stop attempt, and a pursuing detective recognized it by its red paint and tinted windows. Officers arrested three men leaving that car at an Old Town cigar lounge; the victim identified the passenger in a curbside lineup, and a search found no weapons. The driver bailed out the next day; the passenger spent nearly a month in jail, missing Thanksgiving, before the assault with a firearm and evasion charges were dropped. The two men's tort claims say police misread their own surveillance system; their attorney said the city had denied the claims and that a lawsuit would follow.

High Flock Safety license plate readers

Florida: Lindsey Isaacs jailed 13 days on vehicular-homicide charges after troopers treated a Flock license-plate-reader sighting of her SUV as identification; charges dropped and another driver arrested

After a crash on Interstate 4 near DeBary, Florida, on 4 October 2025 killed three people, a Flock Safety automated license-plate reader recorded Lindsey Isaacs's black Dodge Durango about three miles west of the scene two minutes before the collision. Although a 911 caller had described a maroon Durango with a partial plate that did not match, and a Florida Highway Patrol inspection found no crash damage on her SUV, she was arrested on 17 April 2026 on eight felony counts including three of vehicular homicide, spent 13 days in jail (the first several in solitary) and two weeks on bond, and her SUV was impounded for months. On 22 May 2026 the State Attorney's Office declined to prosecute all eight charges and troopers arrested another woman said to have been driving a maroon Durango. Isaacs has filed a federal civil-rights suit against two troopers; Flock Safety says its cameras provide leads, not identifications, and that its data was exculpatory. Florida's attorney general called it 'not a good case'.

If you or someone you know is struggling, free and confidential support is available. Find a helpline near you at Signpost.

Back to all incidents