What are Automated License Plate Readers & How Do They Work?
The short version: Chicago Justice Project's explainer with ACLU of Wisconsin's John McCray Jones breaks down how Flock-style ALPRs profile vehicles far beyond just plates.
Our Take
Credit to the Chicago Justice Project for putting this explainer out there, because most drivers genuinely don't know the scope of what's happening every time they pass one of these cameras. John McCray Jones from the ACLU of Wisconsin lays out the basics clearly: this isn't just a plate number getting logged. Modern ALPR systems are building a visual fingerprint of your car — make, model, color, dents, bumper stickers, roof racks — stamped with the exact time and GPS location it was seen. That's not a license plate reader anymore, that's a vehicle tracking system.
The part that should worry people most is what happens after capture: this data doesn't stay local. It gets fed into shared networks that other police departments, and sometimes federal agencies, can query without a warrant. A single camera on your street corner becomes a node in a nationwide movement-tracking grid, and nobody voted on that. Explainers like this matter because the companies selling this tech, Flock Security chief among them, rely on the public staying in the dark about how granular and networked this surveillance actually is.
If you want to see how far this has already spread, check our camera map to find Flock deployments near you, and if you're ready to push back against unchecked ALPR expansion in your own city or county, our take-action page has concrete steps for getting involved locally.
This is DeFlock The USA’s original commentary. The video above is the work of Chicago Justice Project, published on YouTube — full credit to the creator.