SZUXN v Minister for Immigration

This matter concerned an appeal from a decision of the Refugee Review Tribunal (RRT) refusing to grant the applicant a protection visa. The applicant, who claimed to have faced persecution in Sri Lanka based on ethnic, political, and particular social group grounds, argued that the RRT's adverse credibility findings were unreasonable. The court was asked to review the RRT's decision.

The central legal issue before the court was the standard of "legal unreasonableness" as it applies to administrative decision-making, particularly in the context of reviewing decisions of the Refugee Review Tribunal. The court was required to determine how to ascertain legal unreasonableness, considering whether it arises from an underlying jurisdictional error or can be an outcome-focused assessment of the decision's justification and intelligibility. A further question was whether, when reasons are provided, a reviewing court is confined to those reasons when assessing legal reasonableness.

The court referred to guidance from *Minister for Immigration v Singh*, which explained that legal unreasonableness can be identified either through an underlying jurisdictional error or as an outcome that is arbitrary, capricious, or lacks common sense. The court noted that where reasons are given for a decision, the focus of review for legal unreasonableness should be on those reasons to understand the decision-maker's justification. The court indicated that it is not for the reviewing court to substitute its own judgment for that of the decision-maker. In this case, the court found that the RRT's adverse credibility findings, based on the applicant's failure to articulate his claims comprehensively immediately upon arrival, were unreasonable.

The court ordered that a writ of certiorari issue to quash the RRT's decision of 14 July 2014. Additionally, a writ of mandamus was ordered, requiring the RRT to redetermine the applicant's review application according to law.