The U.S. Department of Justice has issued subpoenas to major technology and retail companies—including Apple, Google, Walmart, and Amazon—requesting user data related to an application linked to a 2021 emissions control lawsuit. The subpoenas seek information on at least 100,000 individuals who downloaded an app associated with EZ Lynk, a company headquartered in the Cayman Islands.

EZ Lynk has been accused by the DOJ of producing a device designed to circumvent computerized emissions controls in vehicles, allegedly violating the Clean Air Act. The lawsuit, filed in 2021, centers on these claims that the device undermines efforts to regulate and reduce automotive emissions. In its latest move, the government is attempting to identify potential witnesses by examining user data provided by the app distributors.

Specifically, the DOJs subpoenas demand personal details including names, addresses, and purchase histories of app users. This marks a notable example of the government seeking to collect data on a broad swath of consumers based on their interaction with a particular mobile application, an approach rarely seen in similar investigations.

EZ Lynk has pushed back against the government’s data request, highlighting concerns over user privacy and confidentiality. The company maintains that the allegations against it are unfounded and argues that collecting detailed user information creates significant privacy risks.

The case underscores ongoing tensions between regulatory enforcement agencies and technology companies, particularly around the handling of user data in investigations that involve digital platforms. As the DOJ continues its inquiry, the outcome may have implications for both emissions control litigation and privacy standards in cases involving app-based data collection.