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 following his arrest, specifically statements made by him and the results of a blood sample taken from him. The prosecution sought to rely on this evidence, while the defence argued it was improperly obtained and should have been excluded.

The High Court was required to determine whether the evidence obtained from Mr Ayles was admissible in light of the circumstances of his arrest and detention. Specifically, the Court had to consider whether the police acted unlawfully in detaining Mr Ayles for an extended period without charging him and whether the subsequent taking of the blood sample and obtaining of statements constituted an abuse of process or a breach of his rights, thereby rendering the evidence inadmissible. The Court also considered the application of the exclusionary rule in relation to improperly obtained evidence.

The Court ultimately held that the detention of Mr Ayles was unlawful and that the evidence obtained thereafter was therefore inadmissible. Gleeson CJ, Gummow, Heydon and Kiefel JJ jointly reasoned that the police had no lawful basis to continue detaining Mr Ayles once they had formed the view that there was insufficient evidence to charge him. The subsequent actions of the police in obtaining statements and a blood sample were tainted by this initial unlawful detention. Kirby J, in a separate judgment, agreed with the outcome but based his reasoning on the broader principles of abuse of process. The Court affirmed the principle that evidence obtained in breach of the law, particularly where it involves unlawful detention, may be excluded if its admission would be unfair to the accused or bring the administration of justice into disrepute.

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