How License Plate Readers Ruin Privacy

Scholl and Bednarz v. Illinois State Police

​We recently reported on the proliferation of automated license plate readers (ALPRs) in Virginia. Now a lawsuit from two Cook County, Illinois, residents make a Fourth Amendment claim against the growing system of ALPRs. It directly sets out the dangers such systems pose to privacy and constitutional rights.
 
The suit by plaintiffs Stephanie Scholl and Frank Bednarz against the Illinois State Police highlights the proliferation of license plate readers to the point of near ubiquity – 300 ALPRs across every expressway in Cook County. Calling this “a system of dragnet surveillance,” the plaintiffs write that law enforcement is “tracking anyone who drives to work in Cook County – or to school, or a grocery store, or a doctor’s office, or a pharmacy, or a political rally, or a romantic encounter, or family gathering – every day, without any reason to suspect anyone of anything, and are holding onto those whereabouts just in case they decide in the future that some citizen might be an appropriate target of law enforcement.”
 
As with so many surveillance systems, danger to privacy lies not just in the mere collection of data, but how long it is stored and when and how it is used.
 
The plaintiffs write that when “law enforcement chooses to investigate a citizen’s past movements, the ALPRs feed databases creating a comprehensive map of their travels, recording every time they’ve driven past ISP’s cameras – and indeed every time they’ve driven past cameras in other jurisdictions using the same database.”
 
The vendor for these devices, Vetted Security Solutions, which uses Motorola’s “Vigilant” system, feeds every detected license plate into Vigilant’s Law Enforcement Archival Reporting Network (LEARN) national database, which holds millions of license plate images that allow millions of Americans to be tracked.
 
The good news is that the Illinois State Police only holds its license plate data for 90 days after it is collected. But this agency is not required by law or by Vigilant policy to do so. Every law enforcement customer is allowed to set their own retention limits – or none at all. The result is potentially years’ worth of data held by law enforcement agencies that track the movements of Americans around the country. Add to this all the data that our cars and GPS systems produce, in addition to all the commercial information that is purchased by federal and local agencies, and we begin to get a sense of the scale of warrantless surveillance of Americans.
 
We should be grateful to Scholl and Bednarz for laying out in plain English the danger license plate readers can pose to Americans. This technology is one more tile being set into an enormous mosaic of capabilities, an emerging American panopticon. It is also one more reason to spark a national discussion on what data the government should collect, and the need for warrants to track Americans. Someone has to watch the watchers, and we can all do our part not to let the government gather such dangerous surveillance powers unnoticed and unchallenged.