Plaintiff B15a v Minister for Immigration and Border Protection

The applicant, Plaintiff B15a, sought judicial review of a decision by the Minister for Immigration and Border Protection concerning their status as an unauthorised maritime arrival. The dispute centred on the interpretation of section 5AA(1A) of the *Migration Act 1958* (Cth), which defines an unauthorised maritime arrival by reference to the status of a parent at the time of the person's birth. The matter came before Kiefel J of the High Court of Australia.

The central legal issue before the Court was whether section 23 of the *Acts Interpretation Act 1901* (Cth) mandated that the phrase "a parent" in section 5AA(1A) of the *Migration Act* should be interpreted as requiring *both* parents to be unauthorised maritime arrivals for the applicant to be so classified. A secondary issue concerned whether the affidavit evidence presented was sufficient to create a genuine controversy requiring resolution by a full trial, or if the matter could be summarily determined.

Kiefel J reasoned that the ordinary and grammatical meaning of "a parent" in legislation refers to one parent, not necessarily both. The Court found no indication within the *Migration Act* or the *Acts Interpretation Act* that a departure from this ordinary meaning was intended or required. Furthermore, the Court determined that the affidavit evidence did not raise a genuine controversy that would necessitate a trial, as there would be no utility in such a proceeding given the clear interpretation of the statutory provision.

The application was accordingly dismissed, and the applicant was ordered to pay the costs of the proceedings.