Oklahoma’s Taxpayer and Citizen Protection Act of 2007 contains a provision requiring employers that contract with the state to use E-Verify, the Internet-based system operated by United States Citizenship and Immigration Services that allows employers to verify the employment eligibility of employees. This provision of the law was challenged as unconstitutional by several business organizations led by the U.S. Chamber of Commerce. The primary argument of the U.S. Chamber was that the law conflicts with the federal Immigration Reform and Control Act (IRCA) and therefore is preempted.

In June 2008, a federal district court found that the U.S. Chamber was likely to prevail on the merits and therefore issued a preliminary injunction against enforcement of the law’s E-Verify provision. On appeal, the Tenth Circuit Court of Appeals reversed the district court’s grant of a preliminary injunction against enforcement of the E-Verify provision. Thus, it appears that Oklahoma may soon be able to enforce the E-Verify provisions of the law.