But thanks to Vigilant, its competitors, and license-plate readers used by police departments themselves, the technology is becoming increasingly ubiquitous over time. And Supreme Court jurisprudence on GPS tracking suggests that repeatedly collecting data “at a moment in time” until you’ve built a police database of 2.2 billion such moments is akin to building a mosaic of information so complete and intrusive that it may violate the Constitutional rights of those subject to it.

The company dismisses the notion that advancing technology changes the privacy calculus in kind, not just degree. An executive told The Washington Post that its approach “basically replaces an old analog function—your eyeballs,” adding, “It’s the same thing as a guy holding his head out the window, looking down the block, and writing license-plate numbers down and comparing them against a list. The technology just makes things better and more productive.” By this logic, Big Brother’s network of cameras and listening devices in 1984 was merely replacing the old analog technologies of eyes and ears in a more efficient manner, and was really no different from sending around a team of alert humans.

The vast scale of Vigilant’s operations is detailed in documents obtained through public-records laws by the New York Civil Liberties Union. “Last year, we learned that the NYPD was hoping to enter into a multi-year contract that would give it access to the nationwide database of license plate reader data,” the civil-liberties group announced Monday in a blog post linking to the document. “Now, through a Freedom of Information Law request, the NYCLU has obtained the final version of the $442,500 contract and the scope-of-work proposal that gives a peek into the ever-widening world of surveillance made possible by Vigilant.”

The NYPD has its own license plate tracking program. It nevertheless wanted access to the Vigilant Solutions database as well, “which means,” the NYCLU notes, “the NYPD can now monitor your car whether you live in New York or Miami or Chicago or Los Angeles.” The NYPD has a long history of spying on Muslim Americans far outside its jurisdiction. And both license-plate readers and the information derived from them have already been misused in other jurisdictions.

More abuses seem inevitable as additional communities adopt the technology (some with an attitude expressed with admirable frankness by an official in a small Florida city: “We want to make it impossible for you to enter Riviera Beach without being detected.”)

Washington is accelerating the spread of the technology.

“During the past five years, the U.S. Department of Homeland Security has distributed more than $50 million in federal grants to law-enforcement agencies—ranging from sprawling Los Angeles to little Crisp County, Georgia, population 23,000—for automated license-plate recognition systems,” the Wall Street Journal reports. As one critic, California state Senator Joe Simitian, asked: “Should a cop who thinks you're cute have access to your daily movements for the past 10 years without your knowledge or consent? I think the answer to that question should be ‘no.’”