314 Human rights in the administration of justice and functions of anyone who may be involved in the custody or treatment of such persons. Article 6 Each State shall keep under systematic review interrogation methods and practices as well as arrangements for the custody and treatment of persons deprived of their liberty in its territory, with a view to preventing any cases of torture or other cruel, inhuman or degrading treatment or punishment. Article 7 Each State shall ensure that all acts of torture as defined in article 1 are offences under its criminal law. The same shall apply in regard to acts which constitute participation in, complicity in, incitement to or an attempt to commit torture. Article 8 Any person who alleges that he has been subjected to torture or other cruel, inhuman or degrading treatment or punishment by or at the instigation of a public official shall have the right to complain to, and to have his case impartially examined by, the competent authorities of the State concerned. Article 9 Wherever there is reasonable ground to believe that an act of torture as defined in article 1 has been committed, the competent authorities of the State concerned shall promptly proceed to an impartial investigation even if there has been no formal complaint. Article 10 If an investigation under article 8 or article 9 establishes that an act of torture as defined in article 1 appears to have been committed, criminal proceedings shall be instituted against the alleged offender or offenders in accordance with national law. If an allegation of other forms of cruel, inhuman or degrading treatment or punishment is considered to be well founded, the alleged offender or offenders shall be subject to criminal, disciplinary or other appropriate proceedings. Article 11 Where it is proved that an act of torture or other cruel, inhuman or degrading treatment or punishment has been committed by or at the instigation of a public official, the victim shall be afforded redress and compensation in accordance with national law. Article 12 Any statement which is established to have been made as a result of torture or other cruel, inhuman or degrading treatment or punishment may not be invoked as evidence against the person concerned or against any other person in any proceedings.