12 In the first instance one has to attend to the section itself. It required the magistrate to be satisfied on the balance of probabilities of a number of things. As I have said, it is only the element in para. (f) that is said to suffer from an error of law in the magistrate's decision. It requires satisfaction that there are reasonable grounds to believe that the conduct of the procedure on the person may tend to confirm or disprove his or her involvement in the commission of the offence. This the magistrate is, in my opinion, entitled to consider regarding the evidence before him objectively, and it is important to note that it is sufficient that the conduct of the procedure may tend, not that it will, not that it must, not that it probably will, but merely that it may tend to confirm or disprove the involvement of the subject person in the commission of the offence. A positive or a negative might come out of the test. It does not matter. It is, as Mr McArdle correctly observed, in my view, an investigative tool, notwithstanding that in this case Marks has already been charged with murder. But the trial has not yet occurred. Moreover, it is a very difficult thing, I think, and it certainly is in the circumstances of this case, to speculate or hypothesise as to the reason or reasons why, in the future, depending on the result of the test, it may be said of it that it may tend to confirm or disprove his involvement. That is not to say that it can not be said now that it may have that consequence. It is rather to say that it is difficult to hypothesise or speculate as to a particular reason why it will have that consequence. The magistrate was rather pressed in that way in the submissions made to him, and in that way, I consider, the submissions were not correctly put in terms of reflecting the issue in para. (f). In the end the magistrate, having retired to consider his decision, returned and in the reasons which he gave and which are contained in the transcription which has been typed and is before me and which is incorporated by reference in the order, he referred to the evidence which had been given on oath by a member of the Homicide Squad. He did not recite that evidence. Plainly enough it was given also in relation to the matters referred to in the affidavit in support. The evidence was of very short compass indeed, and it seems to me to be somewhat artificial to say that in addition to the magistrate saying that he had heard evidence on oath from the witness setting out the circumstances and the background to the application and in relation to the obtaining of the samples and their analysis, and that they had been shown to be not from the deceased, that it was necessary for him to refer to everything said in the evidence. He referred to the evidence in a summary way and in a way that indicates to me that he considered all of the evidence. He then went on and referred to the section and to the various sub-sections, and in particular to para. (f), and he did so in terms which clearly indicate that he had that paragraph and the requirement of it in mind. He said this towards the end of his reasons: