Callaghan v The Queen

In *Callaghan v The Queen*, the High Court of Australia considered an appeal by the applicant, Callaghan, against his conviction for murder. The dispute centred on the admissibility of certain evidence during his trial.

The primary legal issue before the High Court was whether the trial judge had erred in admitting evidence of the applicant's prior convictions and prior bad character. This evidence was admitted on the basis that it was relevant to establishing the applicant's propensity to commit the offence charged. The court was required to determine if this admission contravened the general rule against admitting evidence of bad character to prove guilt.

The High Court, comprising Hayne and Heydon JJ, held that the admission of the evidence of prior convictions and bad character was an error. Their Honours applied the principle that evidence of a person's prior convictions or bad character is generally inadmissible to prove that the person committed the offence with which they are charged, as it is likely to be unfairly prejudicial. While exceptions exist, such as where the evidence is relevant to a specific issue in the case other than propensity, the evidence in this instance did not fall within any recognised exception. The court found that the evidence was admitted solely to demonstrate the applicant's propensity to commit the crime, which was impermissible.

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