R v Ayoub

In the case of R v Ayoub, the appellant sought to appeal against his conviction for armed robbery, arguing that the trial judge had erred in his summing up by suggesting that the evidence of a particular witness needed to be carefully scrutinised. The witness, MacDonald, was not a prison informer or an accomplice, but rather a defence witness. The appeal hinged on whether the trial judge should have issued a warning to the jury regarding the potential unreliability of MacDonald’s evidence.

The primary legal issue before the court was whether the trial judge should have issued a warning to the jury concerning the potential unreliability of MacDonald's evidence. The court had to consider the circumstances under which such a warning is appropriate, particularly in relation to defence witnesses who do not fall into the categories specified in s 165(1) of the Evidence Act. The court was also required to assess whether the trial judge’s comments had potentially prejudiced the jury against the defence’s case.

The court found that the trial judge’s comments were inappropriate as MacDonald was not a prison informer or an accomplice providing evidence against the accused. The court emphasised that warnings and cautions about the potential unreliability of witnesses are usually given when the court has specific knowledge of aspects of the evidence that might undermine its reliability. Given that MacDonald was a defence witness and not implicating the appellant, such a warning was not warranted. The court also noted that judges should avoid giving such warnings routinely without a request from counsel or without consulting with counsel about the necessity and content of the warning. The trial judge had not been asked to provide such a warning by the Crown, nor had he foreshadowed his intention to do so.

Ultimately, the court concluded that the trial judge’s comments were inappropriate and may have prejudiced the jury against the defence’s case. The court allowed the appeal and ordered a retrial.