Director of Public Prosecutions for Victoria v Le

The Director of Public Prosecutions for Victoria (DPP) appealed to the High Court of Australia against a decision of the Victorian Court of Appeal, which had allowed an appeal by Mr. Le against his conviction for trafficking a commercial quantity of heroin. The central dispute concerned the admissibility of evidence obtained through a covert police operation.

The High Court was required to determine whether the evidence obtained by police, including intercepted communications and seized drugs, was admissible despite the fact that the police had engaged in conduct that arguably constituted an abuse of process. Specifically, the court had to consider the application of the exclusionary rule in Australian criminal law, particularly in circumstances where the evidence was obtained in contravention of statutory provisions or common law principles.

The High Court, by majority, allowed the DPP's appeal. The majority reasoned that while the police conduct in obtaining the evidence may have been improper, it did not, in itself, render the evidence inadmissible. The court affirmed the principle that evidence obtained improperly or in contravention of the law is not automatically excluded. Instead, the court must exercise its discretion to exclude such evidence if its prejudicial effect outweighs its probative value. In this instance, the majority found that the probative value of the evidence was high and that the prejudicial effect did not warrant its exclusion. The court emphasised that the purpose of the exclusionary discretion is to ensure a fair trial, and that the mere fact of impropriety in obtaining evidence does not necessarily lead to an unfair trial.

The High Court set aside the order of the Victorian Court of Appeal and reinstated Mr. Le's conviction.