29 The grounds on which the applicant contends that this was unlawful and invalidated the conviction of the prisoner are numerous and far reaching. They all involve the proposition that the trial miscarried because the separation of the jury after it had retired to consider its verdict was contrary to law. The applicant's first argument was that such a separation was contrary to the common law as stated in the decisions of the English Court of Criminal Appeal in Rex v Ketteridge (1915) 1 KB 467 and Rex v Neal (1949) 2 KB 590.
30 In Rex v Ketteridge (supra) it was said that:
"If a juror, after the judge has summed up, in any criminal trial separates himself from his colleagues and, not being under the control of the Court, converses or is in a position to converse with other persons, it is an irregularity which, in the opinion of the Court, renders the whole proceedings abortive …" (supra at 460 per Lush J with whom Darling and Atkin JJ agreed).
See also Rex v Twiss (1918) 2 KB 853 at 858.
31 This statement of the common law was approved in Rex v Neal (supra). In delivering the judgment of the court Lord Goddard CJ said:
"… there is no case to be found in the books where a jury, once given in charge of the bailiff have been allowed to leave the building for any purpose whatever. It was laid down in Coke on Littleton p 227b, that a jury must not, until they are agreed, separate or leave the place appointed for their deliberations … Blackstone's Commentaries Vol 4, p 360, the edition of 1826 by Joseph Chitty, says 'the jury cannot be discharged … till they have given their verdict.'" (at 594-595)
32 The common law as stated in Rex v Ketteridge (supra) and Rex v Neal (supra) was applied in Regina v Chaouk (1986) 23 A Crim R 463. In addition, Kaye J, with whom Fullagar and Hampel JJ agreed, expressly approved of the statement by Sir John Barry J in his article "On the Segregation of Jurors" ((1953) 6 Res Judicatae 139, that the common law rule applicable in Victoria was as follows:
"(i) it is within the discretion of the trial judge in any criminal trial to allow the jury to separate up to the stage when the summing up is concluded and they retire to consider their verdict;
(ii) if the judge orders the jury to be segregated it is unlawful for them to separate. If separation does occur before the conclusion of the summing up, a conviction would not necessarily be invalidated, but the juror or jurors disregarding the order may be punished for contempt of Court;
(iii) the discretion of the judge, if he permits the trial to proceed, will not be reviewed without very substantial reason;
(iv) if the jurors unlawfully separate after retiring to consider their verdict, a verdict of guilty by them is bad and the conviction based on it must be quashed. What constitutes a separation is a question of fact to be decided in each case as it arises;
(v) where a conviction is quashed because of an unlawful separation, the Full Court… may order a new trial." (at 155-156)
33 The Victorian Court of Criminal Appeal had previously approved Sir John Barry's statements as to the nature of the discretion conferred on a trial judge as being "completely accurate" (Regina v Gay (1976) VR 577 at 582, 583) and the strict rule that jurors may not separate after they had embarked on their deliberations was accepted as the common law of Western Australia in Ah Poh Wai v The Queen (1995) 15 WAR 404 at 422 per Malcolm CJ.
34 However, the common law is an evolutionary body of law. It evolves over time to meet and accord with social conditions and community standards. This was recognised by the Victorian Court of Criminal Appeal in Regina v Chaouk (supra) in relation to trials by jury when it said:
"In the passage of time, and with changed social conditions and facilities, it was possible to relax some of the rigidity of the rule. This was achieved by legislation … It is now an exceptional case where jurors are kept together from commencement of the trial until their discharge after verdict …". (at 466)
35 The nature of social conditions, education, means of communication and like factors has changed significantly since the strict common law rule against separation of jurors came into being. These changes have themselves given rise to an amelioration of the harshness of the rule of the old common law. Statute too has stepped in to break down the severity of the rule prohibiting jurors in criminal proceedings from separating. Several States have legislated to permit the separation of juries. For example, Western Australia did so in 1898 (Jury Act 1898 (WA) s 25). New South Wales did so in 1924 (Crimes (Amendment) Act 1924, s 34) when it added such a provision to the Jury Act 1912. As a consequence in Brownlee v The Queen (2001) 207 CLR 278 Gleeson CJ and McHugh J said:
"It is not an essential requirement of trial by jury that there be an inflexible general rule forbidding separation during the whole or any part of a trial." (at 290)
36 In the same case Gaudron, Gummow and Hayne JJ examined the common law of England and the statutory provisions in Australia as they existed at the time of Federation. They concluded that:
"The state of affairs at the time of federation which is thus disclosed suggests that absolute sequestration of the jury was no longer regarded as an essential element of trial by jury." (at 301)