What's an ALPR?

ALPR stands for Automated License Plate Reader. It is a camera that photographs every plate that drives past, reads the number, stamps it with the time and location, and files it in a database that police across the country can search. The biggest name in the business is Flock Safety. You have almost certainly driven past one today.

The two-minute version

You are not the target. Everyone is. An ALPR does not wait for a crime. It logs every car, every time, whether you are a suspect or not. Do that on every road, in thousands of towns, and ordinary driving turns into a searchable record of where you went and when.

It reads more than your plate

Flock sells a feature it calls Vehicle Fingerprint. It identifies your car by make, model, color, bumper stickers, roof racks, dents, and even a temporary paper plate. The company says it can pick your vehicle out of the crowd without ever reading the tag.

Its Nova product goes further, letting an officer search plate data next to police records, jail records, public records, and video from a single screen. Its Raven product puts microphones on public streets. Flock first advertised those mics to flag "screaming," then quietly changed the word to "distress" after the Electronic Frontier Foundation wrote about it.

Plates are only the beginning. A separate company, Leonardo, already sells an add-on called ELSAG SignalTrace that reads the signals your phone, AirPods, and smartwatch broadcast, so the system can tie a device to a car. Your phone is on its way to becoming the next license plate.

It is one big network

As of 2026, Flock runs more than 100,000 cameras across 49 states and roughly 5,000 communities, scanning around 20 billion vehicles a month. In a single ten-month stretch, agencies ran more than 12 million searches against that shared network. A police officer in one state can look up a car in yours.

When it goes wrong

The Institute for Justice has documented at least two dozen cases of innocent drivers pulled over, jailed, or held at gunpoint because a reader misread a plate. In nearly two of three of those cases, officers drew their guns before they realized the mistake. In one Texas case, a single search was logged as "had an abortion, search for female" and reached more than 83,000 cameras nationwide, including states where abortion is legal. And officers keep getting arrested for using the system to stalk exes and dates on their own time.

How to spot one

Look for a small black camera on a slim pole, often solar powered with a rectangular panel on top, aimed at the road instead of a building. People joke that half the "solar panels" on their street are not solar panels. Community maps like DeFlock plot known camera locations, and tools like haveibeenflocked.com let you check whether your own plate has been logged.

Know your rights

The Fourth Amendment protects "the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures." Courts are still deciding how that applies to cameras that track everyone at once. That fight is exactly why this matters.

"The right to be let alone, the most comprehensive of rights, and the right most valued by civilized men." Justice Louis Brandeis, 1928.

Sources: Electronic Frontier Foundation, 404 Media, Institute for Justice, and Flock Safety's own product pages. This page is public information, not legal advice.