2.11 It is the responsibility of the state party to ensure that a person who claims to be a victim of enforced disappearance has the right to inform the competent authorities of the facts and to investigate this claim without delay, while ensuring that necessary measures are taken to protect the complainant, witnesses and relatives of the disappeared person and his advocate, in addition to those involved in the investigation from any ill-treatment or intimidation on account of this allegation or any testimony made. 2.12 The provisions of the International Convention refer to the principle of the inadmissibility of detention in unknown places, and that the national legislation of the State party should include the conditions that permit issuance of orders for deprivation of liberty and the authorities mandated with issuance of such orders. Moreover, it should be ensured that the person deprived of liberty is detained in officially recognized and monitored places and that he is able to communicate with the outside world, including his family, lawyer or any other person of his choice, and allow them to visit him. A foreigner detainee should be granted the permission to contact the consular authorities of the state of which he is a national. 2.13  The International Convention also requires the State party to ensure that its legislation provides that every competent authority and institution under the law has access to places of detention, where necessary, with prior authorization by a judicial authority. The provisions of the Convention further indicate that the State party should ensure the right of every person deprived of his liberty, through his family, to appeal to a judicial body to promptly decide on the legality of depriving him of his liberty and to order his release if it is proved that such detention is illegal. 19