Nikolaidis v The Queen

The appeal concerned the conviction of the appellant, Nikolaidis, for the offence of murder. The appeal was heard by Hayne and Crennan JJ of the High Court of Australia. The central dispute revolved around the admissibility of certain evidence during the trial and whether its admission had led to a miscarriage of justice.

The High Court was required to determine whether the trial judge had erred in admitting evidence of the appellant's prior convictions and prior bad character. Specifically, the court considered whether this evidence was relevant to the issues in the trial and, if so, whether its prejudicial effect outweighed its probative value, thereby rendering its admission unfair and improper. The court also had to consider whether the admission of this evidence constituted a substantial wrong or miscarriage of justice for the purposes of the appeal.

In their joint reasons, Hayne and Crennan JJ applied the principles governing the admission of evidence of prior convictions and bad character, particularly under the Uniform Evidence Acts. Their Honours noted that such evidence is generally inadmissible unless it has a specific relevance to a fact in issue in the current proceedings, beyond merely suggesting that the accused is a person of bad character likely to have committed the offence. They found that the evidence in question was improperly admitted because its prejudicial effect was significant and it did not possess sufficient probative value to justify its admission. The court concluded that the admission of this evidence had resulted in a substantial wrong or miscarriage of justice.

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