Director of Public Prosecutions (WA) v Unwin [No 2]

The case of Director of Public Prosecutions (WA) v Unwin [No 2] involved the Director of Public Prosecutions for Western Australia appealing against the decision of a magistrate to review the detention of the respondent, Unwin. Unwin was a registered dangerous sexual offender, and the matter revolved around the legality of his continued detention under the Dangerous Sexual Offenders (Detention and Management) Act 2004 (WA). The dispute was brought before the Supreme Court of Western Australia, which was required to determine whether the magistrate's decision to review Unwin's detention was lawful and whether any new legal principles were established in the process.

The central legal issue before the court was whether the magistrate had the authority to review Unwin's detention under the Act, particularly in light of previous decisions by the Supreme Court that had limited the scope of such reviews. Additionally, the court needed to ascertain whether the magistrate's decision to review Unwin's detention constituted an error of law and whether any new legal principles were applied that should be considered by the court. The court's decision was pivotal in clarifying the scope of review powers available to magistrates in cases involving dangerous sexual offenders.

In delivering the judgment, the Supreme Court held that the magistrate did not have the jurisdiction to review Unwin's detention as it was not within the scope permitted by the Act. The court emphasised that previous judgments had established a clear limitation on the review process, and the magistrate's decision to conduct a review was contrary to those established principles. The court further clarified that no new legal principles were introduced in the magistrate's decision, and therefore, the magistrate's actions were in error. The Supreme Court quashed the magistrate's decision and restored the original detention order for Unwin.

The court's final orders were that the decision of the magistrate to review Unwin's detention be quashed, and the original detention order under the Act be reinstated. The court's judgment provided clarity on the scope of review powers for magistrates in cases involving dangerous sexual offenders, reinforcing the legal principles established in previous cases.