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The U.S. Department of Justice is seeking the identities, addresses, and purchase histories of at least 100,000 people who used a car app tied to alleged Clean Air Act violations.

Forbes reports that the DOJ issued subpoenas in March and April to Google, Apple, Amazon, and Walmart seeking user records connected to EZ Lynk, the maker of the Auto Agent app and a related car diagnostic tool.

The subpoenas are part of an ongoing case against EZ Lynk. The company was first sued in 2021 for allegedly manufacturing and selling a device designed to bypass computerized emissions controls on cars.

“Emissions controls on cars and trucks protect the public from harmful effects of air pollution. EZ Lynk has put the public’s health at risk by manufacturing and selling devices intended to disable those emissions controls,” U.S. Attorney Audrey Strauss said at the time. “Through our lawsuit, we will prevent Defendants from continuing to sell this product and impose civil penalties to hold them to account.”