Anne Arundel County in Maryland announces a new policy for county contractors:

Contractors doing business with a Maryland county will be required to certify they have no illegal immigrants on the payroll, according to an executive order issued by the county executive.

The Anne Arundel County order, issued this week by Republican County Executive John R. Leopold, requires contractors to sign an affidavit swearing they do not employ people living in the country illegally.

Evidence that a company has hired illegal immigrants would constitute a "material breach of contract," allowing the county to drop the contractor from the job.

The county's press release on this policy is here.