(iv) the failure by the Prosecutor to identify the matters that led to him not offering any evidence until immediately prior to the hearing.
7 The written submissions, which were amplified by Mr Gotting during the hearing, identified two essential elements to establish the s 16(1) offence and which were said to be absent so as to support a costs order in favour of the defendant on the charge not being continued by the prosecutor: first, that the defendant was not an "employer"; and, second, the causation question which concerned the report by Daniel Joseph Leavy, a senior professional engineer with the WorkCover Authority's construction industry team. It was that second element, having in mind that Mr Leavy's report was relied upon by the prosecutor in Byrne Civil Engineering Constructions, that the potential for pre-judgment arose.
8 In the judgment in Byrne Civil Engineering Constructions (from [13] to [22]), I dealt in detail with Mr Leavy's report, including a supplementary statement made by him, and his oral evidence as to the causes of the collapse of the brick wall. The report covered in that respect the conduct of the defendant, van der Meer Bonser Pty Limited (the design engineer for the project), Consolidated Contractions and Byrne Civil Engineering Constructions. In relation to Mr Leavy's evidence, I concluded (in [22]) :
As a general proposition, I found Mr Leavy's evidence to be credible. It was clearly and forcefully presented and in a manner consistent with the supporting technical details referred to by him. Of importance to me, he outlined an objective analysis of the history and condition of the site, the free-standing brick wall's foundations and construction, modifications made to the wall, excavations near the wall, digging at the footings of the wall, work done on the adjacent driveway (including the saw cuts), on-site activities and mechanisms of the failure of walls by reference to the brick wall here concerned; his conclusions were cogent. In particular, his comment that a visit to the site would have raised his concern about the brick wall because, as he said, "one of the fundamental rules of engineering is beware of freestanding structures", I found to be quite telling and meaningful in my consideration of the task in determining the liability of the defendant for the present offence. I accept his evidence.
9 The defendant's submission here made it plain that it challenged Mr Leavy's final report and, hence, and necessarily, the findings made by me in Byrne Civil Engineering Constructions. It is to be noted, however, that the contest arose not in relation to Mr Leavy's initial report but in the supplementary statement made by him on or about 14 September 2000 which apparently qualified the opinion first expressed by him in relation to the cause of the collapse of the brick wall by reference to its then condition as it might involve the defendant but about which there was no issue in Byrne Civil Engineering Constructions. In moving the disqualification application, Mr Hall made clear that insofar as the defendant was concerned the difficulty did not relate to Mr Leavy's first report but to his supplementary statement which, relevantly for the costs application, raised the question whether "the prosecution ever had evidence against the defendant which would have established necessarily to the required standard of causation or not".
10 In the written submission later filed for the defendant on the disqualification aspect, it was stated :
14. The issue as to how, why, in what circumstances and upon what basis Mr Leavy altered his opinion in the way earlier referred to a few weeks prior to the scheduled hearing, against a background when it had been pointed out by the defendant's solicitors that there were problems on causation, raises directly the question which the Commission, it is submitted would need to be satisfied about: was the revision of his opinion made in circumstances where the Commission could be satisfied for itself that the "supplementary statement" was made in fact upon a reliable and sound basis? The Commission would necessarily be concerned and entitled to know whether or not the underlying validity and integrity of his first report was legitimately altered so as to strengthen the case against the defendant in particular.