To verify employment you must contact the human resource office at the state agency that the individual has identified as a current or previous employer. Take note of the details of the offer, as specified in your offer letter, and respond appropriately.Your supervisor will contact you to say welcome. How to Draft an Employment Verification Letter? Use Form I9 to verify the identity and employment authorization of individuals hired for employment in the United States. The following information will assist you in applying for jobs with Fairfax County. You may also download this helpful brochure to assist you. The following information will assist you in applying for jobs with Fairfax County. You may also download this helpful brochure to assist you. There was an error in the withholding.