8 C.F.R. § 1211.4
(a) Pursuant to the authority contained in section 211(b) of the Act, an alien previously lawfully admitted to the United States for permanent residence who, upon return from a temporary absence was inadmissible because of failure to have or to present a valid passport, immigrant visa, reentry permit, border crossing card, or other document required at the time of entry, may be granted a waiver of such requirement in the discretion of the district director if the district director determines that such alien:
[62 FR 10346, Mar. 6, 1997. Duplicated from § 211.4 at 68 FR 9835, Feb. 28, 2003]