This document discusses immigration and I-9 employment eligibility verification forms. It notes that the US has the largest immigrant population of any country and that immigration reform and control acts govern I-9 forms. I-9 forms are used by employers to verify an individual's identity and work authorization as mandated by law. Employers must complete I-9 forms after offering a job to certify they will not knowingly employ unauthorized workers and that employment is contingent upon proof of eligibility.