The U.S. Supreme Court's recent decision in Chamber of Commerce of the United States v. Whiting, which upheld an Arizona statute that sanctioned employers for knowingly or intentionally employing unauthorized aliens, means that retailers with multi-state operations will have to conform to a patchwork of laws rather than a single, uniform federal standard. It also means that we can expect many more states to enact such laws. At last count, approximately 30 states have enacted laws mandating the use of E-Verify.