Today, EFF joined the ACLU of Wisconsin in filing a petition to the Wisconsin Supreme Court, asking it to rule that the state’s constitution requires a warrant for retrospective searches of ALPR databases used by law enforcement in four cities: Milwaukee, Racine, Kenosha, and Green Bay. We represent a religious organization, the Wisconsin Council of Churches, as well as an individual pastor in Green Bay.

As the petition explains:

Right now, Automated License Plate Readers (“ALPRs”) are recording the movements of vast numbers of Wisconsin drivers as they seek medical care, attend 12-step recovery meetings, attend religious services, participate in protests, attend political meetings, and engage in many other private, sensitive activities. Law enforcement entities throughout Wisconsin collect, store, share, and aggregate this ALPR data. Then they search it, retrospectively tracking the movements of individuals and entire communities in ways that would have been prohibitively costly, if not outright impossible, before the advent of ALPR technology.

We all deserve to be free of warrantless mass surveillance. We all deserve to live in a country where surveillance vendors cannot help police upend our system of individualized suspicion. Religious organizations and officials like our clients have a heightened interest in protecting their location privacy because of the range of expressive associations their work entails, including facilitating gatherings for religious worship, as well as offering pastoral care, confidential counseling, and community support. Likewise, the people who visit houses of worship have a strong right to privacy against police monitoring of when they pray, seek addiction counseling, or attend a domestic violence survivor meeting.

This is our second lawsuit challenging warrantless ALPR searches, following SIREN v. San Jose. Earlier this month, a federal court in Oklahoma became the first to rule that ALPRs are a “type of indiscriminate mass surveillance” and suppress evidence from a warrantless ALPR search. We hope the Wisconsin Supreme Court will agree.

Read the Wisconsin Supreme Court petition

Read the press release

In an extremely disappointing ruling, a California trial court dismissed SIREN v. San Jose, our case challenging the city of San Jose’s warrantless searches of its vast stores of automated license plate reader (ALPR) data. EFF and the ACLU of Northern California represent SIREN and CAIR California, two non-profits that serve San Jose residents, in this case.

Make no mistake: We believe this ruling is wrong on the law, and we will appeal. The ruling ignores the importance of landmark rulings from the U.S. Supreme Court regarding the invasiveness of aggregating collected data on an individual over time, including one issued just months ago. It also severely underestimates the harm that ALPRs cause, in San Jose and around the country. 

San Jose’s ALPR surveillance system is inescapable. It blankets the city’s streets in nearly five hundred cameras that continuously photograph every car that passes by and retains the collected data for a month or longer. In our briefs, we argued that law enforcement officers who warrantlessly search the resulting ALPR database are violating the California Constitution’s ban on unreasonable searches and its guarantee of privacy. The court disagreed, explaining that based on one California appeals court case involving individual streetlight cameras, people do not have a reasonable expectation of privacy when driving on a public road. This is wrong. Networked ALPRs are not individual streetlight cameras. Their net effect of tracking and mapping cars as they travel reveals patterns of life, intimate relationships, and much more.

Fortunately, there are signs that the tide is turning against ALPRs in the courts. Just a day before the ruling in our case, a federal district court in Oklahoma called ALPRs “a type of indiscriminate mass surveillance” and decided that a law enforcement officer’s warrantless search of ALPR data violated the Fourth Amendment. The officer was observing traffic on an Oklahoma highway when he saw a woman driving a car with California plates. According to the court order, the officer began following the woman “for no apparent reason” other than her out of state plates. While following her, the officer decided to run the woman’s license plate number through Flock’s ALPR system – again, with no apparent reason other than her California plates. The Flock search returned at least 30 days of data, allowing the officer to track the car across at least three states, over the span of a month, from a single search.

The facts of this case demonstrate how ALPRs allow law enforcement to grab a breathtakingly vast sweep of information about a car (and the driver within) with no more effort than a Google search. It’s true that when a person drives on public roads, they can be observed, including by police. But as the Supreme Court has explained, we don’t expect law enforcement to be able to secretly track and store every movement our cars while we’re driving. The federal court in the Oklahoma case aptly illustrated this difference in societal expectations:

We might reasonably expect our friends and family to tell us something like: “Hey, I saw you out driving by the store last week.” But we do not expect people we know—let alone strangers, and especially not law enforcement—to randomly approach us to say: “Hey, I have been following your car for the last 30 days, and here is a detailed log of every place your vehicle has been with supporting photographic evidence. I am also going to share this information with law enforcement throughout the country so they know your whereabouts, too.

This decision is the first of its kind, and EFF will continue working to ensure that it is the first of many. Outside the courts, we’ve seen people across the country step up to reject ALPRs at the state and local level. EFF will continue challenging this technology on every front as well.