The Constitution of India, 1950
Notwithstanding anything in this Constitution,— (a) no Act of Parliament in respect of— (i) religious or social practices of the Mizos; (ii) Mizo customary law and procedure; (iii) administration of civil and criminal justice involving decisions according to Mizo customary law; (iv) ownership and transfer of land; shall apply to the State of Mizoram unless the Legislative Assembly of the State of Mizoram by a resolution so decides: Provided that nothing in this clause shall apply to any Central Act in force in the Union territory of Mizoram immediately before the commencement of the Constitution (Fifty-third Amendment) Act, 1986; (b) the Legislative Assembly of the State of Mizoram shall consist of not less than forty members.