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testify on his behalf before the court or tribunal on the same conditions as those applying to the witnesses called by the prosecution; and (e) have, without payment, the assistance of an interpreter if he cannot understand the language used at the trial of the offence. (7) When any person is tried for any criminal offence, the court or tribunal shall keep a record of the proceedings and the accused person or any persons authorised by him in that behalf shall be entitled to obtain copies of the judgment in the case within seven days of the conclusion of the case. (8) No person shall be held to be guilty of a criminal offence on account of any act or omission that did not, at the time it took place, constitute such an offence, and no penalty shall be imposed for any criminal offence heavier than the penalty in force at the time the offence was committed. (9) No person who shows that he has been tried by any court of competent jurisdiction or tribunal for a criminal offence and either convicted or acquitted shall again be tried for that offence or for a criminal offence having the same ingredients as that offence save upon the order of a superior court. (10) No person who shows that he has been pardoned for a criminal offence shall again be tried for that offence. (11) No person who is tried for a criminal offence shall be compelled to give evidence at the trial. (12) Subject as otherwise provided by this Constitution, a person shall not be convicted of a criminal offence unless that offence is defined and the penalty therefor is prescribed in a written law; and in this subsection, a written law refers to an Act of the National Assembly or a Law of a State, any subsidiary legislation or instrument under the provisions of a law. The Constitution of the Federal Republic of Nigeria Updated with the First, Second, Third, Fourth and Fifth Alterations 47