R v Hackett

The appeal was heard by the High Court of Australia, with the appellant, Hackett, contesting a conviction for armed robbery. The central issue was whether the trial judge adequately instructed the jury regarding the reliability of identification evidence provided by a witness, who had identified Hackett from a photo board, despite another witness providing contrasting evidence. The appellant argued that the trial judge had not sufficiently differentiated between the identification evidence and similarity evidence, nor had the judge warned the jury about the "displacement effect." The court was tasked with determining whether the trial judge's instructions were adequate and whether any failure to instruct the jury properly constituted a miscarriage of justice.

The legal issues centred on the adequacy of the trial judge's directions to the jury concerning the reliability of identification evidence. The court had to consider whether the trial judge needed to clarify the distinction between identification evidence and similarity evidence, particularly given the contrasting accounts from two witnesses. Additionally, the court examined whether the judge should have warned the jury about the potential "displacement effect," which could arise from viewing a photo board and subsequently identifying a person as the perpetrator. The court's role was to assess whether these omissions by the trial judge constituted a miscarriage of justice that required the appeal to be allowed.

The High Court found that the trial judge had indeed failed to adequately distinguish between identification evidence and similarity evidence, and had not sufficiently warned the jury about the "displacement effect." The court held that these omissions were significant, as they could have led the jury to place undue weight on the photo board identification. The judge's failure to provide these crucial instructions was deemed a miscarriage of justice, leading the court to allow the appeal. The identification evidence, in the absence of proper instructions, was found to be unreliable, and the conviction was consequently overturned.

The court ordered that the conviction be quashed and a new trial be conducted. The appeal was allowed, and the original conviction was set aside. The case underscores the importance of clear and comprehensive jury instructions regarding the reliability of identification evidence, particularly when conflicting accounts are presented.