45 Accordingly, the focus for the purposes of s.5(3)(b)(i) is upon the recording being reasonably necessary for the protection of the lawful interests of either Mr Dimis, as the principal party who speaks in the conversations, or Scanruby, if Mr Dimis is to be viewed for the purposes of the conversations as the personification of Scanruby. Counsel were agreed that the point in time to which the determination as to whether the recording of the conversation was "reasonably necessary" must relate, is the time at which the recording was made. Of course, before the recording may be thought to be reasonably necessary there must exist a relevant lawful interest. Whether the principal party to the conversations in question is viewed as Mr Dimis or as Scanruby, both have for the purposes of these proceedings an interest which I consider may be described as a lawful interest. In the case of Mr Dimis, the interest is not a lawful right although it may be contended otherwise in the case of Scanruby. It appears that the conversation arose at a time when Scanruby and Mr Dimis were claiming a right to continue in occupation of the relevant premises, while Caltex, through its representatives, was intending to terminate the occupancy. The "interest" in pursuing what was perceived to be, whether rightly or wrongly in the final analysis, an entitlement to remain in occupation of the premises, would readily satisfy the lawful interest requirement.
46 In my opinion, the reasonable necessity for the recording, if assessed prior to its being undertaken, cannot be determined by reference to the material later recorded. It matters not whether the material is completely innocuous or damning; if the lawful interest is there and one party is claiming an earlier representation by the other which is denied, it would seem that the recording of conversations in which the position of the other party might be contradicted, whether induced by the recorder or not, would be "reasonably necessary" within the meaning of the section.
47 This view is consistent with a view taken by her Honour Judge Truss in Udini. Her Honour there found, on the balance of probabilities, that the recording by the applicant of the conversation in question was "reasonably necessary for the protection of the applicant's lawful interests, those interests being his entitlement to proper remuneration for the services performed for the first respondent . . . .".
48 I am satisfied that the applicant is not prevented by the Listening Devices Act from relating the relevant parts of the conversation the subject of this motion. Those parts of the conversations are confined, as Mr Donovan submitted, by the scope of the affidavits of the filed. That confinement disposes of any suggestion of oppression or prolixity.
49 I turn then to the arguments concerning s.138 of the Evidence Act 1995. The first is in substance an alternative argument for Caltex to the effect that if the recorded conversations are not excluded by the Listening Devices Act, they are nevertheless "improperly obtained" or "in consequence of an impropriety" as provided by s.138 of the Evidence Act.
50 The structure of s.138 requires, before a consideration of admissibility is undertaken, that the evidence be improper in one of the relevant senses referred to. If the evidence cannot be so described then it is admissible; if it can be so described the balancing exercise taking into account the considerations referred to in subs.(3) must be undertaken. An illustration of the difficulties involved in that matter is the judgment of Miles CJ in R v Truong where his Honour said (at 195):
Section 138(3) lays down a non-exclusive list of matters which must be taken into account, leaving it for the Court to decide how such matters are to be taken into account and what weight of any such matters favour admission or non-admission. It may be implied that the weight of some matters favours admission. For instance, if the probative value was high, that would tend to favour admitting the evidence. If the impropriety or contravention were deliberate that would tend to favour not admitting the evidence. On the other hand, it is far from clear whether the "importance" of the evidence favours admission or non admission. Behaviour contrary to the International Covenant on Civil and Political Rights would appear to favour non admission.
51 The juxtaposition of each of the descriptors, "improperly" and "impropriety", with concepts of illegality support the construction that s.138 may bar the evidence (subject to the operation of subs.(3)) even though it has not been illegally obtained. Bedford v Bedford is an illustration of the application of both the Listening Devices Act and the Evidence Act in this way. Windeyer J, having observed that "It was not seriously contended that the evidence was not improperly obtained", concluded that the Listening Devices Act did not prevent the evidence being adduced nevertheless found that the conduct involved in its recording "was most serious conduct on the part of a solicitor and the client plaintiff. It was deliberate conduct, not some spur of the moment incident. I have no difficulty in finding that the undesirability of admitting the evidence outweighs the desirability of admitting it."
52 Another illustration of the operation of s.138(1) to exclude evidence held to be improperly but not illegally obtained is the judgment of Ireland J in Regina v. Kevin Chi Ho; Alan Tam v The Director of Public Prosecutions (unreported - Supreme Court of NSW - 15 May 1998). As his Honour records, the Commonwealth Director of Public Prosecutions had signed an undertaking, pursuant to relevant statutory provisions, that he would not prosecute Tam in respect of acts or omissions specified in a schedule to the document, provided Tam complied with certain conditions, one of which was that he would give evidence when called upon to do so in proceedings against an identified individual for an alleged offence against the Customs Act. Subsequently, Tam was to be called by the Director of Public Prosecutions to give evidence against other individuals who were his co-accused, but declined to do so. One of those individuals, Ho, sought an order restraining the Crown from calling Tam to give evidence in the Crown case against him. The Crown had indicated its intention to invoke the provisions of s.38 of the Evidence Act 1995 and seek leave to cross-examine him as an unfavourable witness in the event of his refusing to give evidence. The submission for Ho was that this procedure would render the evidence relating to Ho in the induced statement "improperly obtained" within the meaning of s.138 of the Evidence Act. Ireland J found that:
"as a matter of public policy, persons who agree to assist authorities investigating serious crime, and in particular those who give evidence in the Crown case, should not only be fully appraised of the evidence they are to give and the occasions on which it is to be given, but should also be able to rely on the Crown not exceeding the boundaries of the agreement. This is especially so in circumstances such as the present where the sentencing judge in determining the discount on sentence, to which Tam was entitled, had in the forefront of his mind the limited value Tam's evidence may have in light of his declining to testify against his co-offenders. The importance, from the community's point of view of encouraging persons involved in criminal activity to afford assistance to authorities and to give evidence, together with the disadvantages and potential risk to such persons and their families, imposes upon the defendant and other authorities in similar position, a duty to make as clear as possible the extent of the obligations which will devolve upon the informant. In the present case, in light of the Crown proposal to call Tam in the prosecution of Ho, and seek to lead from him by invoking s.38, conversations disclosed in the coerced statement, that was not done.