MZWMT v MIMIA & Anor

The applicants, MZWMT and MIMIA, brought proceedings before the High Court of Australia concerning the interpretation and application of certain provisions within the *Migration Act 1958* (Cth). The core of the dispute revolved around the lawfulness of decisions made by the Minister for Immigration and Multicultural and Indigenous Affairs (MIMIA) in relation to the applicants' immigration status.

The High Court was required to determine whether the Minister's decision to refuse to revoke a deportation order was affected by jurisdictional error. Specifically, the Court had to consider whether the Minister had failed to take into account a relevant consideration or had taken into account an irrelevant consideration when exercising the power to revoke a deportation order under section 48B of the *Migration Act 1958* (Cth).

In their reasoning, Kirby and Callinan JJ applied established principles of administrative law concerning the exercise of statutory powers. The Court emphasised that when exercising a power to revoke a deportation order, the Minister must consider all relevant factors and disregard irrelevant ones. A failure to do so would constitute a jurisdictional error, rendering the decision invalid. The Court analysed the evidence before the Minister and concluded that the Minister had indeed failed to consider a crucial factor, thereby committing a jurisdictional error.

Consequently, the High Court found in favour of the applicants, quashing the Minister's decision and remitting the matter for reconsideration according to law.