Flock cameras, ALPRs, and your route: what drivers should know

26 min readPlain-language guide

In 2020 a reader in Aurora, Colorado matched a stolen motorcycle's plate to Brittney Gilliam's SUV. Officers stopped the family at gunpoint and detained them, children included. The plate they were matching was from another state, on another kind of vehicle. Aurora later paid $1.9 million.

There are more than 185,000 documented readers on American roads and most drivers pass one without noticing. They photograph every car, not just suspect ones — a 2021 EFF analysis found 0.05% of what they collect was relevant to any public safety interest at the moment it was captured. The rest is you, going to work. This page covers what they record, how to recognize one on your street, and what you can do about the ones you cannot avoid.

What an ALPR is

An automated license plate reader (ALPR) is a camera paired with recognition software. It photographs every vehicle that passes, extracts the plate, and files the sighting into a searchable database with a timestamp and location. Many systems also record a vehicle profile: make, body type, color, roof racks, bumper stickers, and other distinguishing marks.

A single reader is unremarkable. Thousands of them, sharing one database, turn ordinary driving into a location history that can be queried later — which is why where the cameras sit matters.

What a Flock Safety camera records

Flock Safety is the largest ALPR vendor in the United States, selling to police departments, homeowner associations, and businesses. A typical capture from a fixed roadside camera includes:

A Flock Safety license plate reader mounted on a pole with a solar panel above it, in a retail parking lot in Eatontown, New Jersey.
One of these, in a shopping center parking lot in Eatontown, New Jersey. Every car that passes it produces the record below.Photo: MiracleMiles · CC BY 4.0
One capture, one passing car
Plate number
read and indexed
Vehicle fingerprint
make, body type, color, damage, stickers
Location
camera position and heading
Timestamp
to the second
Direction of travel
lane and bearing
Retention
set by vendor policy and state law

Beyond plate readers

Plate readers are the part of this you can see from the car, which is why they get the attention. They are one layer of a stack that has grown up around them, and the other layers are worth knowing by name:

  • Real-time crime centersA control room that fuses everything below onto one map

    An RTCC pulls live camera feeds, plate reads, gunshot alerts, drone video, 911 dispatch data and enrolled private cameras into a single screen an analyst watches in real time. EFF and the University of Nevada, Reno counted more than 80 across 29 states in 2020 and over 100 by 2022. This is the piece that changes the character of everything else: separately these are bounded tools, and fused they are a general-purpose way to follow someone.

    Axon Fusus · FlockOS · Motorola CommandCentral Aware

  • AI cameras and video analyticsCameras that classify what they see, not just record it

    Modern security cameras run recognition on the footage: detecting people and vehicles, then making them searchable by attribute — clothing color, vehicle body type, bumper stickers. Vendors market attribute search as the non-biometric alternative to face recognition, and that is a fair description of what most are configured to do. It is worth being precise about why: the underlying detect-classify-search architecture is the same one face recognition uses, and several vendors sell face search as an add-on module on identical hardware. Vehicle-only is a policy setting, not a physical limit.

    Verkada · Genetec · Axon · Flock Safety

  • Drone as first responderDocked drones that launch to a call before an officer arrives

    A weatherproof dock on a municipal roof releases a drone toward a 911 call, streaming video to dispatch. More than a thousand US agencies held FAA waivers for these flights by early 2026, and one California department has a waiver to fly city-wide at up to 400 feet. Chula Vista, which started in 2018, has passed 25,000 missions and publishes a public dashboard — the transparency here is genuinely better than most of this list.

    Flock Aerodome · Axon and Skydio · Brinc

  • Acoustic gunshot detectionPole-mounted microphones that flag loud impulsive sounds

    Fifteen to twenty sensors per square mile listen for the acoustic signature of gunfire and route a clip to a human reviewer. The honest answer to “are they always listening” is that they monitor continuously and buffer locally, and when a loud enough event triggers, the audio clip travels with it — in a 2014 Oakland case that included a victim's voice. Chicago's Inspector General found in 2021 that alerts rarely produced evidence of a gun crime, and the city ended its contract in 2024. Flock piloted adding voice distress detection in 2025 and withdrew it in July 2026.

    SoundThinking (ShotSpotter) · Flock Safety

The reason to group these rather than treat them separately is that a real-time crime center is designed to query them together. A plate read becomes a starting point for camera footage, which becomes a drone launch, which becomes a record that outlives the incident. EFF titled its survey of these rooms Surveillance Compounded, and the word is doing real work: the capability is not the sum of the parts.

How to spot one from the road

Fixed plate readers are not hidden, just unremarkable. Once you know the silhouette you will start seeing them on your own commute, usually in the same five configurations:

  • A slim pole of its own

    Roughly 8 to 12 feet — noticeably shorter than a streetlight, and usually standing on its own in a median, a shoulder, or a subdivision entrance rather than bolted to something that was already there.

  • A small solar panel, tilted at the sky

    Dark cells in a silver frame, mounted above or beside the camera housing. Flock's published specification for its fixed unit lists dual panels at 18–20V and about 21 by 28 inches.

  • No cable running to the ground

    Solar power and a cellular modem are the whole install, which is the point — no trenching, no utility tie-in, no permit for the electrical work. A pole with a conduit running down it is usually something else.

  • A compact black housing

    Rectangular, roughly the size of a shoebox, aimed down the lane rather than at the intersection. Up close, Flock's units often carry a small bird decal.

  • Placed where you have no choice

    City limits, subdivision entrances, arterial intersections, highway on-ramps. Readers are sited at the choke points every car has to pass, not spread evenly across a grid.

What it is probably not: a red-light or speed camera sits on the mast arm of an existing traffic signal, is physically larger, and has a cable running back to the signal cabinet. Traffic counters are small strapped boxes with no lens housing at all. And a fair warning — Flock Safety is the best-known vendor but not the only one. Motorola, Genetec, Leonardo, Neology and Axon all sell readers, and several ship units that look much like each other. Appearance is a strong hint. It is not an identification.

How long the data is kept, and who can search it

This is the question drivers ask first and almost nobody answers properly, because the honest answer is not a number. There is no federal retention standard. What governs your plate read is some combination of state law, the agency's contract, and the vendor's default — and those three frequently disagree.

  • Virginia21 days

    Statutory cap for fixed and portable readers, with sharing limits attached.

  • California30 days

    General cap for public agencies; 60 for the Highway Patrol, longer if held as evidence.

  • New York1 year minimum

    State model policy runs the other way — reads with investigative value are kept, not purged.

  • North Carolina90 days

    Statutory cap. A sworn preservation request extends it to a renewable year, and only then does the agency's own schedule govern.

  • Most statesNo statute

    Nothing in law sets a limit, so the vendor contract and the agency policy are the only rules.

  • Flock Safety's default7 days

    Their LPR policy says data is hard-deleted on a rolling 7-day basis, cut from 30 in August 2026.

Accurate as of . Retention rules changed repeatedly through 2025 and 2026 — check your own state before relying on any figure here.

Access is the other half. Searches are run by agency staff through named accounts and logged with a stated reason, and agencies can share their camera networks with each other. That sharing is what makes the reach hard to picture: a single search run by one Texas official in 2025 reached 6,809 networks and 83,345 cameras. Your local camera is rarely just a local camera.

Where the cameras are

Coverage varies wildly by state and even by neighborhood, which is what makes a documented map useful.

documented readers
185,613
states with coverage
50
open data sources
6

Counts reflect open community data as of — a lower bound on what is actually installed.

What the data has actually been used for

Most plate reads lead nowhere, which is what the 0.05% figure means. The cases below are the documented exceptions. Read them not because they are typical but because they are what a system with this reach does when it fails — and, in the last few, what it does when it works exactly as designed for a purpose the driver never imagined and could not have consented to.

  • Misread platesAurora, Colorado · 2020

    A reader matched a stolen Montana motorcycle plate to Brittney Gilliam's SUV. Officers stopped the family at gunpoint and detained them, including children. Aurora settled for $1.9 million.

    EFF, “The Human Toll of ALPR Errors”

  • Misread platesSan Francisco · 2009

    A reader misread a 3 as a 7. Denise Green was ordered out of her car at gunpoint, handcuffed, and made to kneel in the street. The city paid $495,000.

    EFF, “The Human Toll of ALPR Errors”

  • Stale recordsContra Costa County, California · 2019

    Brian Hofer's car was flagged as stolen because the department had not updated its list after the vehicle was recovered. The plate read was correct; the database was not. Settled for $49,500.

    EFF, “The Human Toll of ALPR Errors”

  • Officer misuseKechi, Kansas · 2022

    An officer was arrested on suspicion of using a Flock Safety database to track his estranged wife. It is not an isolated category — EFF documents comparable cases going back to a 1998 extortion conviction in Washington, D.C.

    EFF, Street-Level Surveillance

  • Immigration enforcementWashington State · 2025

    The University of Washington Center for Human Rights obtained agency audit logs showing federal Border Patrol searches running across local camera networks between May and August 2025 — in several cases through departments that had never knowingly enabled federal sharing.

    UWCHR, “Leaving the Door Wide Open”

  • Reproductive careJohnson County, Texas · 2025

    An official ran a plate search roughly two and a half hours after a report about a woman's self-managed abortion, logging the stated reason as “had an abortion, search for female”. The second search reached 6,809 networks and 83,345 cameras. Officials later described it as a welfare check; the detective's contemporaneous sworn affidavit described a death investigation and consulting the district attorney about charges.

    EFF, October 2025

  • Exposed systemsNationwide · 2025 and 2026

    In January 2025 a researcher found Motorola ALPR units misconfigured to stream unencrypted video and plate data to the open internet; reporting put the count at 150 to 170 feeds. In January 2026 independent researchers found roughly 60 to 67 Flock PTZ cameras livestreaming with no login at all, exposing live video, a month of archive, and admin controls. Both vendors said they were addressing it.

    404 Media, and researcher disclosures

  • OversightWashington, DC · November 2025

    Senator Ron Wyden and Representative Raja Krishnamoorthi asked the Federal Trade Commission to investigate Flock Safety, citing its failure to require multi-factor authentication and at least 35 customer accounts whose passwords had been stolen.

    Office of Sen. Ron Wyden

  • Who gets stoppedOak Park, Illinois · 2022-23

    A local advocacy group reviewed a self-defined sample of 25 stops tied to camera alerts and found 84% involved Black drivers. The number worth comparing it against is not the village's roughly 19% Black population but the department's own 53% figure for all traffic stops in the 2022 state study — the disparity long predates the cameras. On a sample of about 21 people this is suggestive of an existing pattern being amplified, not proof of one being created.

    Freedom to Thrive Oak Park; Illinois Traffic Stop Study

  • State auditIllinois · August 2025

    The Secretary of State audited twelve agencies and found plate data shared with Customs and Border Protection in violation of state law — including through a federal pilot the audit reported Flock Safety's own leadership was unaware of. Illinois ordered the access shut off.

    Illinois Secretary of State, via NBC Chicago and NPR Illinois

Flock Safety has responded to much of this. Its published policy now sets a 7-day default retention, requires a stated reason on every search, and lets an agency switch federal sharing off. Whether those controls hold is a question the audits will answer, not the press releases — and the record above is largely the product of audits.

When the people with access misuse it

The cases above are failures of the machine. These are failures of the people holding the keys, and they are the more common kind. Every officer below was named in mainstream reporting, and the outcome stated is what actually happened to them — several were convicted, several resigned without ever being charged, and the difference is stated because it matters.

  • Lt. Victor HeiarKechi Police Department, Kansas · 2022

    Used a neighboring city's camera network to track his estranged wife's car over the course of a month, then told her she had been “spotted on Meridian.”

    Pleaded guilty to computer crime and stalking. Eighteen months' probation, and Kansas revoked his law enforcement certification.

  • Officer Josue AyalaMilwaukee Police Department, Wisconsin · 2026

    Ran an ex-partner's plate more than 50 times and her new partner's more than 100 — 179 searches in about two months, each one logged with the reason “investigation.” It came to light because one of the people he was tracking looked her own plate up on a public audit-log tool.

    Resigned, pleaded guilty to attempted misconduct in public office, sentenced to probation and a fine. Two four-year restraining orders granted against him.

  • Officer Cristian MoralesMenasha Police Department, Wisconsin · 2025

    Used department credentials off duty to search for an ex-girlfriend's vehicle. The victim described a history of physical abuse.

    Convicted of misconduct in office after a judge rejected his plea deal. Six months in jail, three years' probation, and barred from law enforcement work.

  • Officer Jarmarus BrownOrange City Police Department, Florida · 2024

    Ran an ex-girlfriend's plate 69 times, her mother's 24 times and her father's 15 times over one summer. A colleague warned him to stop before anyone else noticed.

    Arrested and charged.

  • Two officers, both resignedApache Junction and Chandler, Arizona · 2026

    One used the system to locate his wife, logged internally as a welfare check. The other used it to track a family member. Neither department completed its investigation before the officer left.

    Both resigned and were referred to the state board that can strip a police certification. Neither has been charged. Chandler is not renewing its camera contract.

What connects them is not that the system was breached. It worked exactly as designed. A person with a legitimate login typed a plate, wrote a word in the reason box, and received a map of where someone had been. In the Milwaukee case that word was “investigation,” 179 times, and nothing stopped it — the person being tracked found out by looking her own plate up in released audit logs.

Los Angeles, two months, one audit
210.5 million
plates read
5,911
vehicles flagged
161
innocent people stopped or investigated

Between August and September 2025 the Los Angeles Police Department's readers logged 210.5 million plate reads and flagged 5,911 vehicles. An Inspector General audit found 161 innocent people were stopped or investigated on stale or wrong hot-list data — some as high-risk stops, with backup and air support called in. One woman spent thirteen days in jail after being wrongly linked to a hit and run. A magazine editor was tracked for days and pulled over in Minnesota because of a data-entry error made in California. Los Angeles let its contract expire and suspended new deployments.

Do they work?

The whole arrangement is justified by whether these cameras work, and that has turned out to be harder to establish than anyone selling or opposing them tends to admit.

  • What the vendor says

    Flock Safety states that 10% of reported crime in the United States — more than 700,000 crimes a year — is solved using its technology. That figure comes from research written by Flock's own employees, extrapolated from a survey of 123 customer police departments. Of the two outside academics credited with overseeing it, one later told 404 Media he would have done the analysis differently, and that police data is too varied and incomplete for meaningful statistical analysis.

  • What independent research has tested

    A 2011 randomized experiment in the Journal of Experimental Criminology put license plate readers into 30 crime hot spots and found they did not generate either a general or an offense-specific deterrent effect. A later study in the same research line found a narrower result — some longer-lasting reduction in drug-offense calls. The literature is mixed and thin rather than settled.

  • The gap nobody advertises

    Every rigorous study we could find tests LPR-equipped patrol cars driven through hot spots — a different product from the always-on fixed grid your city buys. On that model we could find no independent peer-reviewed evaluation at all, in either direction. The only large study of it is the vendor's own.

  • One city's numbers

    A 2021 policy report analyzing 16 years of data from Piedmont, California found not even a moderate correlation between camera hits and stolen vehicle recoveries, and estimated that under 0.3% of hits produced a useful investigative lead. It is a single-city case study from advocacy-aligned organizations rather than peer review — one data point.

Our read: nobody has disproven fixed camera networks, and nobody without a commercial stake has tested them either. That is a more uncomfortable position than either the vendors or their critics tend to state, and it is a reasonable basis for wanting to choose your own exposure rather than wait for the evidence to settle.

What the law says

Two things drivers most often get backwards. Put plainly:

  • Choosing your route is legal

    No law requires you to take the shortest path between two points, and deciding which public road to use is not regulated. That is the whole basis of this app.

  • Covering your plate is not

    Plate covers, sprays and flipper mechanisms are illegal in every US state. New York now adds surrender of the cover to the fine, and California's 2026 ban reaches the sellers of plate-flipping devices harder than the drivers. It is the fastest way to turn a privacy decision into a traffic stop, and no privacy tool worth using would suggest it.

On the constitutional question, courts have so far mostly held that photographing a plate displayed in public is not a Fourth Amendment search, and a Virginia appellate court reversed a lower ruling on exactly that basis in 2025. The unsettled part is aggregation — whether months of one vehicle's movements, assembled from thousands of cameras, is a different thing in law than a single photograph. Records law has moved faster: a Washington court held in November 2025 that Flock camera images are public records, and that a vendor hosting them on its own servers does not change that.

This is general background, not legal advice. State law varies a great deal and changes often — talk to a lawyer in your state about your own situation.

What you can do about it

You cannot opt out of being photographed on a public road, but you can decide how many documented readers your daily driving passes:

  • Know your map

    Check the documented cameras along the roads you already use. Most drivers find their commute passes more readers than they guessed.

  • Compare before you drive

    A privacy-aware detour is often minutes — not hours — longer. FlockDetour shows the tradeoff as plain numbers so you can choose per trip.

  • Report what you see

    New readers appear weekly. Two-tap reports, verified before publication, keep the shared map honest for everyone.

  • Ask what your town collects

    Agencies keep audit logs of every plate search and the stated reason for it, and those logs are usually obtainable through a public records request. Ask for the logs rather than the images — that is the request that tends to get answered.

  • Show up locally

    Camera contracts are renewed by city councils in public meetings, and dozens of towns have declined to renew. The ones that succeeded timed it to the renewal date and brought a documented compliance failure with them.

What FlockDetour does — and honestly cannot do

FlockDetour routes you around cameras that are documented in its current dataset and warns you as you approach them. That is the whole promise, and it has a hard edge:

See the cameras near you

The live map is free and needs no account.

Open the live map

Questions drivers ask

Can I cover or obscure my license plate to avoid ALPR cameras?
No, and it is not a gray area. Plate covers, sprays, tinted shields and flipper mechanisms are illegal in every US state — some restrict them, some ban them outright — none allow them. New York now takes the cover along with the fine, and California's 2026 ban on plate-flipping devices penalizes both the driver and, far more heavily, whoever sold it. Choosing a different road is legal. Hiding your plate is not — it is a decision that gets you pulled over, not left alone.
Is it legal to drive a route that avoids license plate readers?
Yes. Deciding which public road to drive on is not regulated, and no state requires you to take the shortest path. FlockDetour never suggests breaking a traffic law to avoid a camera — follow posted signs and drive safely.
Do license plate readers work at night or in bad weather?
Yes. Infrared illumination is standard on fixed ALPR hardware, so darkness is not a meaningful obstacle — that faint glow some readers give off is the IR array. Accuracy does fall with heavy rain, snow, low-angle glare, road grime, damaged plates, and non-standard fonts, but weather is a degradation, not a defense.
How accurate are license plate readers?
Accurate enough to be relied on, and wrong often enough to matter. The figure most often quoted — roughly one plate in ten, from a Business Insider analysis cited on the ACLU's campaign page — is narrower than it sounds: it describes how often a reader misreads the issuing state, which is exactly the error behind several of the wrongful stops below. Whole-alert accuracy has measured far worse. An audit of one California city's alerts found 71% of them wrong, and a Los Angeles review found roughly one hotlist alert in three was false. The consequences are documented: EFF has cataloged cases where a misread digit (a 3 read as a 7, an H read as an M) led to drivers being stopped at gunpoint and handcuffed. In one Aurora, Colorado case, the family settled with the city for $1.9 million. Separately, a read can be perfectly correct and still trigger a stop if the underlying alert list is stale, which is what happened to Brian Hofer in California after his recovered car was never cleared from the list.
What is a hotlist?
A list of specific plates flagged as being of interest — stolen vehicles, Amber and Silver alerts, wanted persons — either entered by an agency or imported from state and federal databases. When a reader sees a plate on the list it raises a real-time alert. Worth knowing: agency model policies generally treat a hotlist hit as a lead rather than grounds for a stop on its own — the officer is expected to confirm the plate before acting on the alert.
How long do police keep my license plate data?
It depends entirely on where you are, because there is no federal standard. Virginia caps it at 21 days. California generally allows 30. New York's model policy runs the opposite direction and sets a one-year minimum for reads with investigative value. Most states have no statute at all, which leaves the agency's contract as the only limit. Flock Safety's own published LPR policy now says data is hard-deleted on a rolling 7-day basis by default, cut from 30 days in August 2026. Their separate privacy policy still described the older 30-day rule when we last checked it in late August.
Can a private citizen look up license plate data?
Not the law enforcement databases — federal law restricts release of DMV records, and agency ALPR systems are not open to the public. Two things are within reach. Some states will release audit logs showing which plates were searched and why, though not the underlying images. And a separate, far less regulated commercial market exists in which private ALPR operators sell aggregated vehicle-location data to insurers, lenders and repossession firms.
How do I find out whether someone searched for my plate?
File a public records request with your local agency for its ALPR audit logs — the record of which searches were run, by whom, and with what stated reason. Ask for the logs rather than the images; agencies routinely refuse image requests from non-law-enforcement requesters but audit metadata is more often releasable. A Washington court ruled in November 2025 that these records do not stop being public simply because a vendor hosts them. The volunteer project Have I Been Flocked? also lets you search plates that appear in already-released audit logs.
Does my HOA or apartment complex have license plate readers?
Quite possibly. Flock Safety markets directly to homeowner associations, apartment complexes and businesses, and reporting by The Intercept and others has documented neighborhood deployments across multiple states, often funded from association dues. Private systems on private roads face considerably less oversight than municipal ones. If your association has integrated its cameras with local law enforcement, those reads can reach the same searchable network the police use. Your board should be able to tell you whether that integration is switched on.
Do plate readers see out-of-state plates?
Yes, and that is the point of a networked system rather than an incidental effect. Agencies can search across other participating agencies' cameras nationwide, so a plate from one state is readable and searchable in another. This is the mechanism behind most of the documented controversies — a single search run in Texas in 2025 reached 6,809 networks and 83,345 cameras across the country.
How do I get plate readers removed from my town?
It has been done in dozens of places, and the pattern is consistent: time the fight to contract renewal rather than mid-term, so the city is not paying to break a contract, and get a documented compliance failure through a records request before you start. Austin's council declined renewal in June 2025 after an audit found more than a fifth of searches lacked required justification, and Oak Park and Evanston both canceled in August 2025 after Illinois found unlawful federal access — though Evanston's cameras were reinstalled without authorization weeks later, and it took a cease-and-desist and several months to get the last of them down. From there it is coalition-building wider than privacy advocates, turnout for the vote, and a check afterward that the hardware actually came down. The ACLU publishes a model cancellation resolution to start from.
Is FlockDetour affiliated with Flock Safety?
No. FlockDetour is independent and is not affiliated with or endorsed by Flock Safety or any surveillance vendor. On this site, a Flock camera means hardware sold by Flock Safety or a comparable vendor; FlockDetour is the name of this app.

Sources & further reading