Nauru has a complex legal system. Its Supreme Court, headed by the Chief Justice, is paramount on constitutional issues. Other cases can be appealed to the two-judge Appellate Court. Parliament cannot overturn court decisions, but Appellate Court rulings can be appealed to the High Court of Australia.[37][38] In practice, however, this rarely happens. Lower courts consist of the District Court and the Family Court, both of which are headed by a Resident Magistrate, who also is the Registrar of the Supreme Court. There are two other quasi-courts: the Public Service Appeal Board and the Police Appeal Board, both of which are presided over by the Chief Justice.