Director of Public Prosecutions v Preston (Ruling No 3)

The case of Director of Public Prosecutions v Preston (Ruling No 3) was heard before a judge of the Supreme Court of Victoria. The appellant, the Director of Public Prosecutions, challenged the respondent's decision to exclude certain evidence from a murder trial. The crux of the dispute revolved around the admissibility of gunshot residue (GSR) and text message evidence in the context of a murder trial.

The legal issues before the court involved the assessment of the probative value of GSR and text message evidence against the potential prejudicial effect on the defendant. The court was tasked with determining whether the trial judge had correctly exercised his discretion under the Evidence Act 2008 (Vic) to exclude the GSR evidence, and whether the exclusion of this evidence was an error that might affect the fairness of the trial.

The court held that the trial judge's decision to exclude the GSR evidence was not erroneous. The judge found that the probative value of the GSR evidence was substantially outweighed by the potential for prejudice, particularly due to the risk of misleading the jury about the significance of the residue. Conversely, the text message evidence was deemed to have sufficient probative value to be admitted, as it did not pose the same prejudicial risk. The court concluded that the trial judge had correctly exercised his common law discretion under section 137 of the Evidence Act 2008 (Vic).

As a result of this ruling, the court did not overturn the trial judge's decision to exclude the GSR evidence but did not mandate a specific course of action regarding the text message evidence. The decision underscored the importance of balancing probative value and prejudicial effect in the admission of evidence, particularly in high-stakes criminal proceedings such as murder trials.