b. Priority Date Validity After Visa Issuance:
(1) After Visa Issuance but Before Admission to United States: An alien issued an immigrant visa (IV) who fails to enter the United States would be entitled to the priority date previously established by the petition. However, since the visa has expired, the alien must apply for a new visa. If all the circumstances remain the same, you may proceed with issuing the visa. If, however, the same circumstances do not exist, you should request an AO from L/CA. (See 9 FAM 304.3-1.)
(2) After Admission to United States:
An alien cannot reuse a priority date which was used for the issuance of an immigrant visa (IV) which the alien in turn used to gain lawful admission into the United States