Technology entity · ALPR
Cameras that photograph every passing vehicle, read the plate with optical character recognition, and write a timestamped, geolocated record to a searchable database. The individual reading is mundane. The database is not — because a sufficient number of readers, retained long enough and networked widely enough, reconstructs where a person has been.
An automated license plate reader (ALPR) is a camera system that photographs passing vehicles, uses optical character recognition to read the license plate, and stores a record containing the plate number, a timestamp, and the camera's location. Most modern municipal systems upload these records to a networked database that can be searched later and, in many configurations, searched by other agencies.
No. A camera records an image. An ALPR converts that image into a structured, searchable database record. The difference matters legally and practically: a photograph of a street requires a human to review it, while a database of plate reads can be queried in seconds for every place a specific vehicle has been seen.
Formally it records vehicles. In practice a vehicle is a strong proxy for the person who drives it, and a sequence of timestamped sightings is a movement history. Where that history shows a person parked — a place of worship, a clinic, a union hall, a lawyer's office, a partner's home — the inference about the person is immediate.
Because the constitutional question has never been about a single observation. Anyone can see your car on a road. The issue is the aggregation: persistent, automated collection retained over time and made searchable produces something no human observer could assemble, and it does so for people suspected of nothing. Unsurveilled's position is that public life is not blanket consent to government tracking, and that the relevant limit is on what the government may build and retain, not on what may be glanced at.
No, and that is the point of the ask. A warrant requirement of the kind Unsurveilled advocates targets access to historical, networked data about people who are not suspects. Real-time alerts on a stolen vehicle, an Amber Alert, or a plate connected to an active investigation are not what the requirement is aimed at. The distinction is between investigating a suspect and searching everyone's movement history to find one.
It varies enormously by jurisdiction and by contract, from days to years, and in many places it has never been established publicly at all. Retention is the single field that most changes the privacy consequence of a system, which is why every jurisdiction dossier on this site carries it as an explicit field — including when the honest answer is "not established."
An ALPR does four things in sequence, and the privacy consequence is in the last one rather than the first:
Steps 1 through 3 describe an instrument. Step 4 describes an archive.
The weakest version of the case against ALPRs is “cameras are watching you in public.” That argument loses, and it should — a police officer may look at your car.
The stronger version is about what aggregation produces. One sighting is an observation. Ten thousand sightings across a metropolitan area, retained for a year and searchable by plate, is a movement history that no officer could have compiled by watching. It is generated automatically, about everyone, in advance of any suspicion — and it can be searched retroactively once someone becomes interesting.
This is the distinction Unsurveilled draws everywhere on this site:
Investigate suspects. Don’t surveil everyone.
Directed investigation of a person connected to suspected wrongdoing through lawful process is legitimate and useful. Building a searchable archive of everyone’s movements, and searching it later, is a different activity that happens to use the same hardware.
Four fields determine what a deployment actually means, and three of them are usually harder to obtain than the camera count everybody quotes:
| Field | Why it decides the outcome |
|---|---|
| Retention | Thirty days is an operational tool. Two years is a movement archive. Same hardware. |
| Sharing | Whether a resident’s data leaves the jurisdiction, and who can search it without telling anyone locally. |
| Legal standard | Whether a historical search needs individualized justification, or only a login. |
| Audit | Whether misuse is ever discovered — and, as Chandler shows, how long that can take. |
A city with 40 cameras, 30-day retention, sharing off by default, and a warrant requirement for historical search is in a substantially different position from a city with 12 cameras, two-year retention, and statewide sharing enabled. Camera counts alone tell you very little, which is why every dossier on this site carries all four fields — and says “not established” when that is the truth.
Unsurveilled does not pretend the benefits are imaginary. Agencies do recover stolen vehicles with these systems, and they do generate leads in serious cases. Those claims are listed above as stated benefits because that is what they are: claims made by agencies and vendors, some well supported and some not.
What we ask is that the benefit be weighed against the actual configuration rather than the best-case description of it — and that a capability powerful enough to be worth buying be constrained by something more durable than the good intentions of whoever currently holds the login.
Claims made by agencies and vendors. Listed fairly, not endorsed.
Outcomes on record, not hypotheticals.
More than 400 events in nearly every state, organised by DeFlock. Council meetings, records requests, information sessions. The organisers say plainly what it is not.
Get the Flock Out coordinates state affiliates, model legislation, and litigation. It also publishes figures — and one of them is testable against our own map.
A Pinal County resident said he used his work truck to bend a license-plate reader pole so the camera pointed at the sky. He was arrested and faces a felony criminal-damage charge — in a state where two agencies have just walked away from their ALPR contracts.
A resolution is not a cancellation. In Binghamton the authority sits with the mayor, the mayor has said no, and one of the contracts renews automatically this month.
Three years of routine audits found nothing. The fourth found something. The largest Arizona city running Flock Safety cameras responded by revoking every officer's access and ending the program outright.
The largest ALPR vendor in American policing announced real, substantial limits on its own product. It also left the one question this campaign is about exactly where it was.
Verified as of