Immigration and Customs Enforcement officials have mined state driver’s license databases using facial recognition technology, analyzing millions of motorists’ photos without their knowledge.

In at least three states that offer driver’s licenses to undocumented immigrants, ICE officials have requested to comb through state repositories of license photos, according to newly released documents. At least two of those states, Utah and Vermont, complied, searching their photos for matches, those records show.

In the third state, Washington, agents authorized administrative subpoenas of the Department of Licensing to conduct a facial recognition scan of all photos of license applicants, though it was unclear whether the state carried out the searches. In Vermont, agents only had to file a paper request that was later approved by Department of Motor Vehicles employees.