Ayles v The Queen

The High Court of Australia considered an appeal by Mr Ayles against his conviction for murder. The central dispute concerned the admissibility of evidence obtained from Mr Ayles during police interviews, specifically statements made after he had been cautioned.

The High Court was required to determine whether the caution administered to Mr Ayles was sufficient to render his subsequent statements admissible, given the circumstances of his detention and questioning. Specifically, the Court had to consider the application of the common law exclusionary rule concerning improperly or unfairly obtained evidence, and whether the caution given was adequate to overcome any unfairness.

The Court reasoned that a caution, to be effective in rendering subsequent statements admissible, must be administered in a way that the suspect understands their rights and the consequences of speaking. In this instance, the caution was found to be inadequate because it was delivered in a manner that did not clearly convey to Mr Ayles that he was not obliged to answer questions and that anything he said could be used against him. The Court applied the principle that evidence obtained in circumstances that are unfair to the accused may be excluded, even if technically obtained in accordance with some procedural requirements.

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