Constitutional provisions cannot be derived from colonial policies. Colonial policies refer to the rules and regulations enforced by a colonial power in a foreign territory that they control. These policies do not have any legal authority or relevance in an independent country with its own constitution. Constitutional provisions can be derived from statutory sources, which are written laws passed by the legislature, customary sources, which are long-established customs and practices recognized by the legal system, and judicial precedents, which are past court decisions that establish legal principles.