The Supreme Court just upheld the 2007 AZ law that mandated businesses to use E-Verify.
But Janet Napolitano told the governor of South Carolina that E-Verify can't be used to check immigration status.
http://www.foxnews.com/on-air/on-the-record/transcript/haley-vs-napolitano-e-verify-and-illegal-immigration
So, we have the court approving the law. And the Department of Homeland Security making it impossible to enforce.