Evidence for prosecution and examination of witnesses. Re-examination by prosecutor

The oral and documentary evidence for the prosecution shall then be produced; the witnesses shall be examined by or on behalf of the prosecutor and may be cross- examined by or on behalf of the person accused. The prosecutor shall be entitled to re-examine the witnesses on any points on which they have been cross-examined, but not on any new matter, without leave of the commissioner who also may put such questions as he thinks fit.