The nature of the unfairness which justifies the exclusion of a confession that is voluntary and apparently reliable should be identified: per Brennan CJ in Swaffield at 107.
14 Thirdly, there is the public policy or Bunning v Cross discretion. There is an overlap with the unfairness discretion. Brennan CJ said in Swaffield at 108:
"Thus the chief object of the public policy discretion is the constraining of law enforcement authorities so as to prevent their engaging in illegal or improper conduct, although the securing of fairness to an accused is a relevant factor in the exercise of the discretion."
15 Fourthly, there is the unduly prejudicial ground. This involves the weighing of unfair prejudice against probative value.
16 Reference was made in the joint judgment of Toohey, Gaudron and Gummow JJ to ss 90 and 138(1) of the Evidence Act 1995 (NSW). In their opinion, the statutory provisions were to be construed as co-extensive with the common law. Accordingly, what is said in Swaffield and Pavic applies in this state notwithstanding that the appeals in that case were from Queensland and Victoria where there is no comparable legislation.
17 There was a difference of emphasis in the way in which the results were expressed in Swaffield and Pavic. In relation to Swaffield's case, Brennan CJ noted that the police officer, relevantly a person in authority, deliberately misrepresented himself not to be a police officer in order to secure answers to questions which Swaffield had earlier told the police he would not answer. There was a public interest in ensuring that the police did not adopt tactics that were designed simply to avoid the limitations on the inquisitorial functions. In Swaffield's case such a limitation arose from rule 2 of the Judges' Rules (Where a police officer has decided to charge a person, he should first caution such person before asking questions.). Brennan CJ thought that the decision in Swaffield's case could have gone either way and that the High Court should not interfere in a question touching the standard and methods of police investigation unless the decision was erroneous in principle or otherwise manifestly wrong.
18 On the other hand, Toohey, Gaudron and Gummow JJ thought that the admissions were elicited by the undercover police officer in clear breach of Swaffield's right to chose whether or not to speak. They said the Court of Appeal was right in its conclusion. That was a more emphatic statement but with the same result.
19 In relation to Pavic's case, Brennan CJ said (at 114):
"[35] In Pavic's case, the confessional statements were made to Clancy whom Pavic knew as a friend. Clancy was not a police officer or other person in authority over Pavic. There was no impropriety in the police obtaining Clancy's consent to the recording by Clancy of his intended conversation with Pavic. A serious crime had been committed and the means adopted for its solution and for the securing of evidence against the prime suspect were quite legitimate. The investigation of crime is not a game governed by a sportsman's code of fair play Bunning v Cross (1978) 141 CLR 54 at 75; 19 ALR 651 per Stephen and Aickin JJ. Fairness to those suspected of crime is not the giving of a sporting opportunity to escape the consequences of any legitimate and proper investigation or the giving of a sufficient opportunity 'to invent plausible falsehoods' R v Lee (1950) 82 CLR 133 at 152.
[36] The fact that Clancy was regarded as trustworthy by Pavic is an indicator of the reliability of the admissions made to Clancy. There was no public interest to be served by rejecting those admissions. The Court of Appeal in Victoria was therefore right to dismiss Pavic's application for leave to appeal."
20 On the other hand, Toohey, Gaudron and Gummow JJ said that, in all the circumstances, there was no sufficient reason to interfere with the trial judge's refusal to exclude the evidence of the conversation in Pavic's case. That was a less emphatic statement but with the same result.
21 The present case is a fortiori Pavic for the following reasons. The "accusatory stage" had not been reached in the present case. The police had not made up their mind to charge the accused. (I should mention that Mason CJ was of the opinion in Van Der Meer (1988) 35 A Crim R 232 that a caution was required if the police believed they had sufficient evidence to charge the accused, as distinct from having made up their mind to do so (at 239-240). However, that was not a view shared by the other members of the court. It is a view shared by Kirby J in Swaffield and Pavic at [142], but, again, there is no support to be found for that approach in the judgments of other members of the court.) Neither of the accused had refused to answer questions by the police in relation to the death of Mr Burton. So far as Miss Cassar is concerned, the only relevant conversation was the one to which I have referred, with Detective Sergeant Henderson, in which Miss Cassar did not decline to answer questions. On the contrary, she expressed a willingness to speak to the police about what she could or could not say. She telephoned the police to do so. It was just that, as she would have it, that she knew nothing about the matter. That, according to her, was all she could say to the police and she said it. Detective Sergeant Henderson told her there was no point in coming in for an interview in those circumstances, nor was there. That was not an election by Miss Cassar to decline to answer questions by the police about the Burton stabbing.
22 The asserted unfairness identified by counsel for Miss Cassar was that Miss Cassar had been led into making inculpatory statements to her mother and her sister by the police, who had provided information to her family with a view to procuring such admissions.
23 Factually, I accepted that as being correct. However, the police action involved no impropriety. No trickery or misrepresentation was demonstrated. Even if it had been, that would not necessarily have carried the day. It did not in relation to Pavic's case, in Swaffield and Pavic, [35] above
24 The leniency which is to be extended to the police in the application of the unfairness principle is demonstrated by that case. It is also demonstrated by O'Neill (1995) 81 A Crim R 458, where Dowsett J said, concerning a civilian (one Lally) who was used as a police agent in such a way (at 553):
"It cannot be said that because Lally was acting covertly on behalf of the police, there was inequality in the relationship between her and the appellant which might suggest to the appellant that she was under an obligation to speak. No question of involuntariness or unfairness arose from the fact that the appellant was not warned. The police are not obliged to be absolutely frank in investigating crime. Indeed, the law providing for the use of listening devices is statutory authority to the contrary. Although we might all prefer that friendship not be exploited for ulterior purposes, the public interest in detecting and punishing crime outweighs social nicety."
25 The unfairness ground was not made out in the present case.
26 I will now give my reasons for refusing to disallow the evidence of the recorded conversations, tape by tape, having regard to other objections which were raised .