8. The question before the primary judge in the present matter was whether the loss of the T-shirt in this case required, in the circumstances, the remedy of a permanent stay.
9. His Honour recognized that the mere fact that potentially important evidence is lost or unavailable will not, by itself, warrant that response.
10. It was clear that the issue at trial would be whether the Crown had negatived the clearly available hypothesis that the accused had acted in self-defence.
11. It was also apparent that the accused had received a serious stab wound in the course of his altercation with the complainant. If that wound appeared to have been effected with the steak knife that had come from the complainant's motor vehicle and was found outside of it at the scene, that would strengthen that hypothesis. It would be inconsistent with an alternative hypothesis that the accused had accidentally stabbed himself with his own knife in the course of the struggle with the complainant in which he had brought the knife to the struggle to assault the complainant with it, though that, of itself, would not necessarily disprove self-defence.
12. The steak knife itself had been tested but no blood or DNA had been detected on it. The T-shirt may have revealed whether the steak knife, with a serrated blade, or a chef's knife, with a smooth edged blade, had passed through it. The fact that the steak knife was clear, on later examination, of genetic material, could not be conclusive of its non-involvement in causing the wound to the accused's abdomen.
13. It was clear, and Mr Refshauge did not dispute it, that there were three knives involved in the scuffle leading to the stabbings of the accused and the complainant. The complainant had asserted that the steak knife fell out of his car onto the ground and had played no part in the events that later occurred. There was a statement made by the accused which supported the view that it was not used in the scuffle, though it had been brandished but it could not be said with certainty that the accused's impression that the steak knife was discarded was accurate.
14. Mr Refshauge also conceded that the prosecution could not contend that the wound to the accused's abdomen had been caused by the complainant throwing the accused's chef's knife at him after he had obtained possession of it following their physical altercation.
15. It was also apparent that the complainant had been stabbed, not with the chef's knife, or, indeed, the steak knife, but with a small paring knife the accused had had in his pocket. He said he drew it to protect himself from the complainant who had obtained possession of the chef's knife.
16. Indeed, Mr Refshauge further conceded that it was not a strong case for the prosecution on negating self-defence, even if the prosecution evidence was substantially accepted.
17. However, his contention, even allowing that, was that a fair trial was not prevented by the loss of the T-shirt.
18. In R v Slattery [2002] NSWCCA 367 (4 September 2002), a lost weapon was relied on to demonstrate a similar prejudice to the accused in that case. It was not available for independent testing on behalf of the accused. The Court of Criminal Appeal (Hodgson JA, Hidden J and Smart AJ) agreed that the loss of the weapon in question did have a prejudicial effect but considered that a direction could eliminate that unfair prejudice.
19. The suggested direction so to do was (at [93]):