Harriman v The Queen

Harriman v The Queen concerned an appeal to the High Court of Australia following a conviction for murder. The appellant, Harriman, had been found guilty of murder by a jury in the Supreme Court of Queensland and sentenced to life imprisonment. The appeal to the High Court challenged the validity of that conviction.

The central legal issue before the High Court was whether the trial judge had erred in law by admitting evidence of the appellant's prior convictions. Specifically, the court had to determine if the admission of this evidence, which was presented by the Crown to establish a pattern of behaviour and thus suggest the appellant's propensity to commit the offence charged, was unfairly prejudicial to the appellant and therefore inadmissible. The court also considered whether the judge's directions to the jury regarding this evidence were adequate to mitigate any potential prejudice.

The High Court, in a joint judgment delivered by Gaudron, Gummow and Kirby JJ, held that the admission of the evidence of prior convictions was an error of law. Their Honours reasoned that such evidence, when admitted solely to demonstrate a propensity to commit the crime charged, is generally inadmissible because its prejudicial effect outweighs its probative value. The court found that the trial judge's directions to the jury were insufficient to overcome the inherent unfairness of admitting this evidence, as they did not clearly and effectively instruct the jury to disregard the appellant's past conduct when considering his guilt for the present offence.

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