<P> Constitutional law is the body of law which defines the role , powers , and structure of different entities within a state , namely , the executive , the parliament or legislature , and the judiciary ; as well as the basic rights of citizens and , in federal countries such as India and Canada , the relationship between the central government and state , provincial , or territorial governments . </P>
the fact that the three branches can only do what is in the constitution is an example of
Constitutional law