 1 to the Convention, which entered into force on 1 March 2002, provides for non-member States of the Council of Europe to accede to the Convention, but none have been invited to do so to date.After 20 years of experience, this European model was adapted and generalised by the United Nations through the OPCAT optional protocol to the UN Convention Against Torture (2006).Members of the CPT are independent and impartial experts from a variety of backgrounds, including law, medicine and the justice system.