Diplomatic Passport Law and Legal Definition
According to 22 CFR 41.26 [Title 22. Foreign Relations; Chapter I. Department of State; Subchapter E. Visas; Part 41. Visas: Documentation of Nonimmigrants under the Immigration and Nationality Act, as Amended; Subpart C. Foreign Government Officials] a diplomatic passport means “a national passport bearing that title and issued by a competent authority of a foreign government.”