They will need to fill out a Form DS-71 in front of the passport agent. You must sign the statement of consent in front of a notary. •.The date of the notary's signature must be the same as the date of your signature. •. Your witness must prove his or her identity and complete and sign an Affidavit of Identifying Witness (Form DSP71) before acceptance agent. Use our Form Filler to fill out your form and print it. For the best experience, use a desktop or laptop computer. How do I get a U.S. passport? Your witness must prove his or her identity and complete and sign an Affidavit of Identifying Witness (Form DSP71) before acceptance agent. Your sponsor complete a notarized affidavit of support. You may download the affidavit (PDF).