Employers work hard to make sure they comply with federal immigration law, but they must remember not to take their efforts too far. Employers should remember that while they must verify the ability of their potential hires to work, they cannot ask for specific documents, or have separate requirements for those individuals based on their national origin or citizenship status. Federal law prohibits: 1) citizenship status discrimination in hiring, firing, or recruitment or referral for a fee, 2) national origin discrimination in hiring, firing, or recruitment or referral for a fee, 3) document abuse (unfair documentary practices), and 4) retaliation or intimidation.