The Form I-9 is a required part of the hiring process by which employers verify the identity of newly-hired employees and their eligibility to work in the United States. As of April 3, 2009, employers were required to start using the February 2, 2009 revised Form I-9. The revised form confirms that expired documents are no longer acceptable forms of identification; the Passport Card is now an acceptable List A document; and certain resident and employment authorization cards are no longer acceptable.