E-verify is not mandatory at the Federal Level. It is only mandatory in certain states due to state law: "In addition, some states have specific laws that req

E-verify is not mandatory at the Federal Level. It is only mandatory in certain states due to state law: "In addition, some states have specific laws that require employers in the state to use E-Verify. This is currently the case in Alabama, Arizona, Georgia, Mississippi, North Carolina, South Carolina, and Utah (for employers with 15 or more employees). Louisiana and Tennessee require E-Verify unless an additional, alternate verification step is completed as outlined under state law. Other states have the E-Verify requirement limited to contractors or public employers. However, the list of states seems to be growing, and there is legislation afoot in both the U.S. Senate and the House of Representatives that may mandate E-Verify for all employers (depending on size)."