From the Highlights: "The United States is home to millions of undocumented individuals who are often motivated to come here in search of work. U.S. Citizenship and Immigration Services (USCIS) verifies the employment eligibility of newly hired individuals through the E-Verify system. E-Verify is critical for helping to maintain the integrity of the Nation's immigration system and ensuring only authorized individuals gain employment. We conducted this audit to assess the effectiveness of E-Verify to electronically confirm employment eligibility."
Department of Homeland Security, Office of Inspector General, Report No. OIG-21-56
Department of Homeland Security Office of Inspector General: https://www.oig.dhs.gov/