By decision of the Judges at the Nineteenth plenary session of the International Criminal Tribunal for the former Yugoslavia (ICTY) one new rule was adopted and 16 rules of the Rules of Procedure and Evidence were amended. The new rule concerns affidavit evidence. The rule regarding amendments of the rules was changed so that an amendment shall enter into force seven days after the day of issue of an official Tribunal document containing the amendment, instead of immediately after the issuance. The rules on contempt of the Tribunal and false testimony under solemn declaration were made stricter as they were both amended to allow for a Chamber to impose substantially longer terms of imprisonment on persons who have been found guilty of such offences.