or if the interests of justice so require, and the right to the free assistance of an interpreter if he cannot understand or does not speak the language used in court. 5.  The right to examine or have his lawyer examine the prosecution witnesses and to on defense according to the conditions applied to the prosecution witnesses. 6. The right not to be compelled to testify against himself or to confess guilt. 7. The right, if convicted of the crime, to file an appeal in accordance with the law before a higher tribunal. 8. The right to respect for his security of person and his privacy in all circumstances. Article 17 Each State party shall ensure in particular to any child at risk or any delinquent charged with an offence the right to a special legal system for minors in all stages of investigation, trial and enforcement of sentence, as well as to special treatment that takes account of his age, protects his dignity, facilitates his rehabilitation and reintegration and enables him to play a constructive role in society. Article 18 No one who is shown by a court to be unable to pay a debt arising from a contractual obligation shall be imprisoned. 12