"DHS has primary responsibility for identifying visa overstays and taking enforcement action to address security risks. We conducted this audit to determine the effectiveness of Immigration and Custom Enforcement's (ICE) information technology (IT) systems to review, track, and share information associated with visas."
Department of Homeland Security, Office of Inspector General, Report No. OIG-17-56
Department of Homeland Security, Office of Inspector General: https://www.oig.dhs.gov/