Why Does the Common Law Conform to the Constitution?

The High Court has often said that the common law must conform to the Constitution. The High Court has not completely explained why this is so. This requirement is not explicitly mentioned anywhere in the Constitution itself. A number of scholars have suggested possible answers. One is that the Constitution is the supreme law and binding on everyone. Another suggestion has been that the common law must conform because the Constitution constrains ‘state action’: something more than just an exercise of constitutionally conferred power. This latter explanation appears to deviate from the High Court's exposition of the common law's relationship with the Constitution in Lange v Australian Broadcasting Commission. This article suggests that the Constitution has a broader application to the common law, in that it constrains all uses of judicial power, not just those that are considered to be ‘state action’. It contends that it is implicit in s 71 of the Constitution that the power to develop the common law yields to constitutional imperatives. This theory is more descriptively consistent with the High Court's practice and observations about the relationship between the common law and the Constitution.