Matson v The Attorney-General of the Commonwealth of Australia

The applicant, Mr Matson, sought constitutional or other writs from the High Court of Australia. The dispute concerned the Attorney-General of the Commonwealth of Australia's decisions on 7 July 2022 to refuse to revoke a prior determination for Mr Matson's surrender to the United States of America, and to refuse to revoke the associated surrender warrant. Mr Matson alleged various errors in these "Non-Revocation Decisions," including unreasonableness, irrationality, apprehended bias, and denial of procedural fairness.

The Court was required to determine whether Mr Matson's application for constitutional writs, specifically prohibition, certiorari, mandamus, and habeas corpus, disclosed an arguable basis for relief. The Court also considered the practical effect of the application, given that the deadline for the execution of the surrender warrant had passed and the warrant had been executed.

The Court reasoned that the Attorney-General's discretion to refuse to revoke a surrender determination, like the discretion to make one under section 22 of the Extradition Act 1988 (Cth), need only be exercised in good faith and consistently with the objects, scope, and purpose of the Act. The Court found that the Attorney-General's reasons for the Non-Revocation Decisions demonstrated good faith and consistency with the Act. Furthermore, the Court held that the Attorney-General was not obligated to consider all matters raised by Mr Matson, provide reasons for refusing to revoke, or afford Mr Matson further opportunities for representation or legal advice. Consequently, none of the alleged errors were capable of invalidating the Non-Revocation Decisions.

Given that Mr Matson's application disclosed no arguable basis for the relief sought and had become moot due to the execution of the surrender warrant, the Court dismissed the application with costs.