 For instance, Indian decisions are persuasive in the areas of criminal law and procedure because Singapore borrowed heavily from India in these areas.The Constitution provides that the President may refer to a tribunal consisting of not less than three judges of the Supreme Court for its opinion any question as to the effect of any provision of the Constitution that has arisen or appears likely to arise.Where a Constitutional Tribunal has given an opinion, no court has jurisdiction to question the opinion, or the validity of any law the bill for which was the subject of a reference to the Tribunal.