Plaintiff S297/2013 v. Minister for Immigration and Border Protection & Anor; Plaintiff M150 of 2013 by his Litigation Guardian Sister Brigid Marie Arthur v. Minister for Immigration and Border Protection & Anor

The applicants, identified as Plaintiff S297/2013 and Plaintiff M150 of 2013, sought judicial review of decisions made by the Minister for Immigration and Border Protection. The core of the dispute concerned the lawfulness of the applicants' detention, which had been extended beyond the period permitted by law. The matter was heard by the High Court of Australia.

The central legal issue before the High Court was whether the continued detention of the applicants, after the expiry of the period for which their detention was authorised by law, constituted an unlawful detention contrary to the provisions of the *Migration Act 1958* (Cth) and the Australian Constitution. Specifically, the Court had to determine the legal consequences of a detention that exceeded the statutory authority.

The High Court held that the detention of the applicants was unlawful. The Court reasoned that the *Migration Act* did not authorise the indefinite detention of non-citizens, and that once the statutory period for detention expired, the executive government had no power to continue that detention without fresh legal authority. The Court affirmed the principle that detention must have a legal basis, and that the executive cannot detain individuals indefinitely in the absence of such a basis, as this would infringe upon fundamental common law rights and constitutional principles. The Court found that the detention was not for a purpose authorised by the *Migration Act* or the Constitution.

The High Court made orders that the detention of the applicants was unlawful and ordered their release.