22 C.F.R. § 53.4 Optional use of a valid passport.
Title 22 - Foreign Relations
Nothing in this part shall be construed to prevent a citizen from using a valid passport in a case in which that passport is not required by this part 53, provided such travel is not otherwise prohibited.
Title 22: Foreign Relations
PART 53—PASSPORT REQUIREMENT AND EXCEPTIONS
§ 53.4 Optional use of a valid passport.
