Learn About ALPR & Flock Safety

License plate readers now watch American roads by the hundreds of thousands — quietly logging where you drive, when, and how often. Here’s what that technology actually is, who’s behind it, and why it matters.

What is an ALPR?

An Automated License Plate Reader (ALPR) is a camera system that photographs every passing vehicle, uses software to read the license plate, and records the plate number along with the exact time, date, and GPS location. Many systems also capture a vehicle’s make, color, and distinguishing features — bumper stickers, roof racks, damage — so a car can be identified even without a plate.

Each scan becomes a searchable record. Stitch millions of them together and you have a detailed map of where ordinary people go: your commute, your doctor, your place of worship, the protest you attended, the friend you visited.

What is Flock Safety?

Flock Safety is the largest ALPR vendor in the United States. It sells camera systems to police departments, homeowners’ associations, and private businesses, and connects them into a nationwide, searchable network. A camera bought by one town’s police can often be searched by agencies in other towns and states.

Unlike a traffic cam that only reacts to speeders, a Flock camera records everyone — no suspicion, no warrant, no opt-out. The company markets it as crime-fighting infrastructure; critics see a private surveillance dragnet spreading faster than any public debate about it.

Why it matters

• Mass tracking without a warrant. Your movements are recorded whether or not you’re suspected of anything, and that history can be searched later.
• Data retention & sharing. Records are stored for weeks or longer and can be shared across agencies — sometimes far beyond the community that installed the camera.
• Mistakes have consequences. Misread plates and bad database “hits” have led to innocent drivers being stopped at gunpoint.
• Mission creep. Systems sold to catch stolen cars get repurposed for immigration enforcement, tracking protesters, or monitoring people seeking lawful medical care.
• No consent, little oversight. Most cameras appear with no public vote, no retention policy, and no independent audit.

The record: don’t take our word for it

None of the concerns above are hypothetical. Courts, civil-liberties lawyers, and investigative journalists have been building the paper trail for years:

• A judge said it looks unconstitutional. In 2024 a Norfolk, Virginia judge rejected warrantless Flock evidence, likening citywide plate tracking to a Fourth Amendment search — and the Institute for Justice filed a federal lawsuit arguing you can’t drive anywhere in that city without being tracked.
• The crime-reduction claims don’t hold up. Forbes checked a city where Flock claimed crime dropped after installation — burglaries had actually gone up. An earlier IPVM lab study found roughly one in ten reads was wrong.
• Misuse isn’t rare. The Institute for Justice documented at least 16 cases of officers using plate readers to stalk romantic interests, and 404 Media has tracked a running pattern of police arrested for stalking with Flock.
• The data goes further than your town. 404 Media revealed federal immigration authorities querying the nationwide network; in California, police shared plate data with federal agencies illegally.
• Security is a promise, not a track record. Flock left dozens of its AI cameras exposed to the open internet, where anyone could watch a month of footage.
• Communities are pushing back — and winning. Austin organizers got the city’s contract canceled, and NPR counts dozens of localities dropping their cameras. Longform context: the ACLU’s 2022 report, the EFF’s neighborhood ALPR primer, and the Washington Post on what these cameras do to a neighborhood.

Want the running feed? Every story we track lands on the National Index — 1,400+ headlines and counting, going back to 2019.

How widespread is it?

Volunteers with the open-source DeFlock project have already mapped well over a hundred thousand ALPR cameras nationwide. You can browse that data on our Camera Map and look up your own town.