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Some categories of persons employed by or affiliated with the United Nations are not normally entitled to receive a laissez-passer, e.g.: goodwill ambassadors, Messengers of Peace, consultants of United Nations organizations and funds and programmes, experts on missions for the United Nations, and individual and institutional contractors.
However, in accordance with section 22 of the Convention on the Privileges and Immunities of the United Nations, individuals who are designated as experts on missions for the UN may be issued a United Nations Certificate, which is not a legal travel document but serves to certify that the holder is travelling on official business on behalf of the UN or specialized agency or related organization.[7]