38 The difficulty that trial judges are experiencing in this area is probably due to the fact that there are no hard and fast lines to be drawn. The issue is whether there is a circumstance in the case that gives rise to a perceptible risk of a miscarriage of justice, and accordingly gives rise to the need for a warning. That will depend on the circumstances of the case, the time that elapsed, and whether the accused is placed at a significant disadvantage. Sometimes a relatively short lapse of time will put the accused at a disadvantage. Sometimes a lengthy lapse of time will not put the accused at a disadvantage. It all depends on the circumstances. Alternatively, there may be a factor that calls for a comment rather than a warning. These are matters on which views can differ. Views have differed in appeal courts. Nor can trial judges resort to the easy course of giving a warning when there is a possibility that one might be called for. The giving of excessive and inappropriate warnings will be unfair to complainants, contrary to the public interest in a regularly conducted trial process, confusing to juries and runs the risk of returning this aspect of the law to an approach from which Parliament endeavoured to extract it, when Parliament enacted provisions such as s 34I(5) of the Evidence Act 1929 (SA).