Pfennig v The Queen

This case, heard in the High Court of Australia, concerned an appeal by Pfennig against a conviction. The core of the dispute revolved around the admissibility of similar fact evidence presented during the trial.

The legal issues before the High Court included whether similar fact evidence could be admitted solely on the basis that it demonstrated a criminal disposition on the part of the accused, or if its probative force must arise from some other characteristic of the offending. The Court was also required to consider the application of established principles, particularly those derived from cases such as *Boardman's case*, in assessing the admissibility and probative value of such evidence.

The Court's reasoning, as indicated by the submissions presented, focused on the principle that similar fact evidence is only admissible if its probative force arises from circumstances beyond merely showing a criminal disposition. This means the evidence must possess a unique or distinctive quality, often referred to as a "signature quality" or "modus operandi," that links the uncharged conduct to the charged offence in a way that is highly probative of the accused's identity or guilt. The Court considered various authorities, including Canadian and American jurisprudence, to support the proposition that the similarities between offences must be sufficiently striking or idiosyncratic to justify admission, rather than relying on a general propensity to commit crimes.