Thailand

… May all Thai people unite in observing, protecting and upholding the Constitution of the Kingdom of Thailand … (Preamble)

The Constitution is the supreme law of the State. The provisions of any law, rule or regulation or any acts, which are contrary to or inconsistent with the Constitution, shall be unenforceable.
Whenever no provision under this Constitution is applicable to any case, an act shall be performed or a decision shall be made in accordance with the constitutional conventions of Thailand under the democratic regime of government with the King as Head of State. (Sec. 5)

... Any right or liberty stipulated by the Constitution to be as provided by law, or to be in accordance with the rules and procedures prescribed by law, can be exercised by a person or community, despite the absence of such law, in accordance with the intent of the Constitution. ... (Sec. 25)

… The decision of the Constitutional Court shall be final and binding on the National Assembly, the Council of Ministers, Courts, Independent Organs, and State agencies. (Sec. 211)

An amendment to the Constitution which amounts to changing the democratic regime of government with the King as Head of State or changing the form of the State shall be prohibited. (Sec. 255)