The Constitution of Pakistan requires that all laws conform with Islam and not conflict with the Quran or Sunnah. The Council of Islamic Ideology reviewed the British era legislation and found most of it did not conflict with Sharia.[152] Sharia was declared the Supreme Law of Pakistan in the 1991 Enforcement of Shariat Act. Section 4 stipulates that courts select an interpretation of law consistent with Islamic jurisprudence and principles.[153]