GBF v The Queen

The High Court of Australia considered an appeal by GBF against a conviction for murder. The dispute concerned the admissibility of certain evidence during GBF's trial, specifically evidence relating to alleged prior bad conduct by the appellant.

The central legal issue before the High Court was whether the trial judge erred in admitting evidence of GBF's prior alleged violent conduct towards the deceased, which was admitted as evidence of motive and to rebut a defence of accident. The Court was required to determine if this evidence was unfairly prejudicial to the appellant and therefore inadmissible under the rules of evidence, particularly concerning the propensity of an accused to commit a crime.

The High Court held that the admission of the evidence of prior bad conduct was an error. Their Honours reasoned that while such evidence may be relevant to motive, its prejudicial effect in suggesting a propensity to commit the crime outweighed its probative value. The Court applied the principle that evidence of prior misconduct should not be admitted if its primary purpose is to show that the accused is a person of bad character likely to have committed the offence charged. The admission of this evidence was found to have deprived the appellant of a fair trial.

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