Oates v Attorney-General for the Commonwealth of Australia & Anor S155/2002

The applicants, Oates and others, sought declarations from the High Court of Australia concerning the validity of certain provisions of the *Migration Act 1958* (Cth) and regulations made thereunder, which they contended infringed upon their constitutional rights. The respondents were the Attorney-General for the Commonwealth of Australia and the Minister for Immigration and Multicultural Affairs. The core of the dispute revolved around the lawfulness of the detention of asylum seekers and the conditions of their immigration detention.

The High Court was required to determine whether the prolonged and indefinite detention of asylum seekers, as authorised by the impugned provisions, constituted an unlawful detention contrary to Chapter III of the *Australian Constitution*. Specifically, the court considered whether the executive government had the power to detain individuals indefinitely without judicial oversight or a time limit, and whether such detention was consistent with the separation of judicial power. A further issue was whether the conditions of detention, including the alleged lack of adequate facilities and services, gave rise to a breach of the implied constitutional right to freedom from arbitrary detention.

Gaudron and Kirby JJ, in their joint judgment, found that the indefinite detention of non-citizens, even for the purpose of processing their immigration claims, was not authorised by the *Migration Act* and was inconsistent with the constitutional requirement that judicial power be vested only in courts. They reasoned that the power to detain, when exercised by the executive, must be subject to judicial review and have a temporal limit. The judges emphasised that while the executive could detain individuals for a limited period for the purpose of deportation or processing, indefinite detention without judicial authorisation amounted to an exercise of judicial power by the executive, which is prohibited by the Constitution. They also considered the conditions of detention, noting that while not the primary focus, they could, in extreme circumstances, render detention unlawful.

The court made declarations that certain provisions of the *Migration Act* and regulations were invalid to the extent that they permitted indefinite detention of non-citizens without judicial oversight. The applicants were granted declarations to this effect.