Соответствующая норма
Chad
Practice Relating to Rule 117. Accounting for Missing Persons
Section C. International cooperation to account for missing persons
Chad’s Decree on the Establishment of a Commission of Inquiry (2008) states:
Article 1: A Commission of inquiry has been established for the events that occurred in the Republic of Chad from 28 January to 08 February 2008 and their consequences.
Article 2: The mission of the commission of inquiry is to find and provide information about people reported missing …
Article 5: The President of the Commission may invite States, international institutions and organizations to participate in the work of the Commission of Inquiry as observers. 
Chad, Decree on the Establishment of a Commission of Inquiry, 2008, Articles 1–2 and 5.