The United Nations has no authority to issue passports. Even its affiliated agency, the High Commission for Refugees, has no authority to issue passports to any of the 43 million refugees throughout the world. Nor does the U.N. have the authority either to condone or condemn passports of any kind, national or otherwise. To its own personnel, it issues a travel document known as a laissez-passer.
и далее..
While there is no mention of passports or visas in the document, Article 13(2) refers to the freedom of travel: "Everyone has the right to leave any country, including his own, and to return to his country."
The World Service Authority issues the only passport that conforms strictly to this specified right. Though the passport derives from a United Nations document, the U.N. itself, as a mere assemblage of sovereign nations, can neither recognize nor reject it.
то есть документ в одну сторону, и так понимаю одноразовый
http://www.worldservice.org/issues/aprmay96/un.html