Plaintiff M47/2018 v Minister for Home Affairs

In *Plaintiff M47/2018 v Minister for Home Affairs*, the High Court of Australia considered a special case concerning the immigration detention of an unlawful non-citizen. The plaintiff, who arrived in Australia using false identity documents, had been detained since his arrival. The Minister for Home Affairs relied on sections 189 and 196 of the *Migration Act 1958* (Cth) to authorise the plaintiff's ongoing detention. The plaintiff challenged the lawfulness of this detention, arguing that these provisions no longer authorised it or, alternatively, that their application to him exceeded the Commonwealth's legislative power.

The central legal issues before the Court were whether sections 189 and 196 of the *Migration Act* authorised the plaintiff's continued detention, and if so, whether these provisions were constitutionally valid in their application to him. A key factual element underpinning these questions was the plaintiff's identity and the prospects of his removal from Australia. The plaintiff contended that the inability of the authorities to establish his identity meant there was no practical possibility of his removal, thereby rendering his detention unlawful.

The Court, in its joint reasons, addressed the plaintiff's invitation to draw specific inferences from the facts presented in the special case. It applied the principle that evidence is weighed according to what a party could have produced or contradicted, noting that the plaintiff, not the defendants, was in the best position to provide information regarding his identity and place of origin. The Court concluded that the plaintiff's inconsistent statements about his background did not demonstrate genuine uncertainty or ignorance, and therefore, it could not be assumed that he was unable to provide further information that might improve his prospects of removal. Consequently, the Court found that the inferences urged by the plaintiff were not available, and no factual basis was established to support the argument that his detention was unlawful.

As a result of these findings, the Court answered the questions posed in the special case. It determined that no question arose as to the lawfulness of the plaintiff's detention under sections 189 and 196 of the *Migration Act*, nor did any question arise regarding the constitutional validity of those provisions in his case. The Court ordered that no relief should issue to the plaintiff and that the plaintiff should pay the costs of and incidental to the special case.