"Independence of Judiciary is the key to the success of federalism." Examine the statement

Independence of Judiciary is very much required in the federal system of government because;
(i) Judiciary acts as an umpire if disputes arise between different levels of government in the exercise of their respective powers.
(ii) Judiciary also interprets the Constitution and the powers of different levels of government.
(iii) Hence, judiciary is the key to the success of federalism.