Article 4 of Protocol No. 7 to the ECHR – right not to be tried or punished twice
Right not to be tried or punished twice
1. No one shall be liable to be tried or punished again in criminal proceedings under the jurisdiction of the same State for an offence for which he has already been finally acquitted or convicted in accordance with the law and penal procedure of that State.
2. The provisions of the preceding paragraph shall not prevent the reopening of the case in accordance with the law and penal procedure of the State concerned, if there is evidence of new or newly discovered facts, or if there has been a fundamental defect in the previous proceedings, which could affect the outcome of the case.
3. No derogation from this Article shall be made under Article 15 of the Convention.