Plaintiff S51/2011 v Minister for Immigration and Citizenship & Anor

The applicant, identified as Plaintiff S51/2011, sought judicial review of a decision made by the Minister for Immigration and Citizenship, the first respondent, and the second respondent, concerning the applicant's immigration status. The dispute centred on the validity of the Minister's decision to refuse to revoke a mandatory detention notice issued under s 189(1) of the *Migration Act 1958* (Cth). The matter came before Gummow J of the High Court of Australia.

The central legal issue before the Court was whether the Minister's decision to refuse to revoke the mandatory detention notice was vitiated by an error of law. Specifically, the Court was required to determine if the Minister, in considering whether to revoke the detention notice, had failed to take into account a relevant consideration, namely the applicant's status as a non-citizen who had been granted a protection visa. This involved an examination of the scope of the Minister's power under s 197C of the *Migration Act* and the nature of the duty owed by the Minister when exercising that power.

Gummow J reasoned that the Minister's power to revoke a detention notice under s 197C was discretionary, but this discretion was not unfettered. His Honour held that the Minister was bound to consider all relevant considerations, and that the applicant's status as a holder of a protection visa was a paramount and relevant consideration. The Minister's failure to acknowledge or give proper weight to this fact meant that the decision was affected by an error of law, as it was not made according to law. The Minister had, in effect, failed to exercise the discretion conferred by s 197C.

Consequently, Gummow J made orders quashing the decision of the Minister to refuse to revoke the mandatory detention notice.