Dunstan v The Queen

In *Dunstan v The Queen*, the High Court of Australia considered an appeal by the applicant, Dunstan, against his conviction for murder. The central dispute concerned the admissibility of certain evidence obtained during a police investigation.

The High Court was required to determine whether the trial judge had erred in admitting evidence that had been obtained in circumstances where the applicant was under arrest and had not been cautioned in accordance with the requirements of the relevant legislation. Specifically, the court had to consider the application of section 30 of the *Evidence Act 1977* (Qld) (now repealed) and the principles governing the admissibility of evidence obtained in breach of statutory provisions.

The Court held that the trial judge had erred in admitting the evidence. McHugh and Heydon JJ reasoned that the purpose of section 30 was to protect the rights of persons under arrest and to ensure that any statements made by them were voluntary and informed. The failure to caution the applicant as required by the section rendered the subsequent evidence inadmissible, as it had been obtained in contravention of the statutory safeguards. The Court applied the principle that evidence obtained in breach of a statutory provision designed to protect individual rights should generally be excluded, unless there were compelling reasons to admit it, which were not present in this case.

Consequently, the High Court allowed the appeal, quashed the conviction, and ordered a new trial.