Nguyen v The Queen

In *Nguyen v The Queen*, the Court of Appeal of Western Australia considered an appeal against a conviction for aggravated robbery. The appellant, Mr Nguyen, was found guilty by a jury of robbing a service station and was subsequently sentenced. He appealed his conviction, arguing that the trial judge had erred in admitting certain evidence and in their directions to the jury.

The central legal issues before the Court of Appeal were whether the trial judge had wrongly admitted evidence of the appellant's prior convictions and whether the judge's directions to the jury regarding the use of that evidence were adequate. Specifically, the court had to determine if the prejudicial effect of admitting the prior convictions outweighed their probative value, and if the jury was properly instructed on how to consider this evidence, ensuring it was not used as evidence of propensity.

The Court of Appeal analysed the admissibility of the prior convictions under the relevant evidence legislation, considering the purpose for which the evidence was admitted. The court found that the evidence of prior convictions was admitted for a limited purpose, namely to establish a common modus operandi between the prior offences and the offence charged. However, the court concluded that the trial judge's directions to the jury were insufficient to adequately mitigate the risk of prejudice. The directions failed to clearly explain to the jury that they must not use the prior convictions as evidence that the appellant was a person likely to commit such offences. Consequently, the court found that there was a substantial miscarriage of justice.

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