Attorney-General (Tas) v Casimaty

The High Court of Australia heard an appeal concerning a dispute over the construction of a public work in Tasmania. Mr Casimaty, a landowner with an interest in adjacent land, alleged that the Department of State Growth's proposed construction of a new interchange contravened section 16(1) of the *Public Works Committee Act 1914* (Tas). This section mandates that public works be referred to and reported upon by the Parliamentary Standing Committee on Public Works before commencement. Mr Casimaty contended that the interchange Hazell Bros Group Pty Ltd was engaged to construct differed materially from the proposal previously reported on by the Committee. The Attorney-General for Tasmania, joined as a defendant, sought to strike out Mr Casimaty's claim, arguing it disclosed no cause of action as there was no justiciable issue before the court, or that adjudication would infringe upon the privilege of the Tasmanian Parliament.

The central legal issue before the High Court was whether the conditions precedent stipulated by section 16(1) of the Act, requiring referral and reporting by the Parliamentary Standing Committee on Public Works, imposed an obligation enforceable by a court. The court was required to determine if a private litigant could bring proceedings to enforce compliance with these statutory conditions, or if such matters fell within the exclusive cognisance of Parliament. This involved considering the principles of parliamentary privilege, the separation of powers, and the concept of justiciable controversies.

The High Court reasoned that the duty imposed by section 16(1) of the Act was predominantly concerned with the internal affairs of Parliament and the accountability of government to Parliament. The court held that adjudicating on allegations of non-compliance with these conditions would necessarily involve the court assuming authority over core institutional aspects of Parliament, thereby contravening the privilege of Parliament and the principle of separation of powers. The court emphasised that the risk of conflicting decisions between the courts and Parliament, and the potential for inefficiency, were strong justifications for maintaining this separation. Consequently, the court concluded that Mr Casimaty's claim fell within the exclusive cognisance of the Parliament of Tasmania and was not a matter for judicial enforcement.

The High Court allowed the appeal, setting aside the orders of the Full Court of the Supreme Court of Tasmania. In their place, the court ordered that the appeal from the Supreme Court of Tasmania be dismissed with costs, and that Mr Casimaty pay the appellant's costs of the appeal to the High Court.