A/HRC/10/9 page 93 the maintenance of centralized registers of all places of detention, the duty to investigate fully all alleged cases of disappearance, the duty to try alleged perpetrators of acts of disappearance before ordinary (not military) courts, the exemption of the criminal offence of acts of enforced disappearances from statutes of limitation, special amnesty laws and similar measures leading to impunity. The Working Group reminds the Governments of these obligations not only in the context of clarifying individual cases but also that of taking action of a more general nature. It draws the attention of Governments and non-governmental organizations to general or specific aspects of the Declaration, it recommends ways of overcoming obstacles to the realization of the Declaration, it discusses with representatives of Governments and non-governmental organizations how to solve specific problems in the light of the Declaration, it assists Governments by carrying out on-the-spot visits, organizing seminars and providing similar advisory services. The Working Group also makes observations on the implementation of the Declaration when the concerned Government has not fulfilled its obligations related to the rights to truth, justice and reparation. The Working Group adopts general comments whenever it considers that a provision of the Declaration requires further clarification or interpretation. Admissibility of reports on disappearances Reports on disappearances are considered admissible by the Working Group when they originate from the family or friends of the disappeared person. Such reports may, however, be channelled to the Working Group through representatives of the family, Governments, intergovernmental organizations, non-governmental organizations and other reliable sources. They must be submitted in writing with a clear indication of the identity of the sender; if the source is other than a family member, it must have direct consent of the family to submit the case on its behalf, and it must also be in a position to follow up with the relatives of the disappeared person concerning his or her fate. The Working Group does not deal with situations of international armed conflict. Elements for admissibility In order to enable Governments to carry out meaningful investigations, the Working Group provides them with information containing at least a minimum of basic data. In addition, the Working Group constantly urges the senders of reports to furnish as many details as possible concerning the identity of the disappeared person and the circumstances of the disappearance. The Group requires the following minimum elements: (a) Full name of the disappeared person and, if possible, age, gender, nationality, and occupation or profession; (b) Date of disappearance, i.e. day, month and year of arrest or abduction, or day, month and year when the disappeared person was last seen. When the disappeared person was last seen in a detention centre, an approximate indication is sufficient (for example, March or spring 1990);