First, I am unable to identify in the judgments in Re Tracey any general line of reasoning in relation to service-related offences which enjoyed the support of a majority of the seven Justices who constituted the Court. Secondly, the acceptance of Re Tracey as authority for the highest common factor which enjoyed majority support is attended by conceptual difficulties. That highest common factor is to be found in the conclusion of Brennan and Toohey JJ. that a service tribunal could validly be invested with jurisdiction to deal with both the disciplinary and community aspects of a service-related offence in a case where ("if, but only if") the proceedings can "reasonably be regarded as substantially serving the purpose of maintaining or enforcing service discipline" [46] . As their Honours recognized [47] , in the context of provisions purportedly conferring a wider jurisdiction, the effect of that conclusion would be that a service tribunal was required to determine, presumably as a preliminary question of jurisdiction, whether the proceedings in a particular case would "serve a substantial disciplinary purpose". Examination of the other judgments in Re Tracey discloses, however, that such a test is, on the differing views expressed by the other members of the Court, either unnecessary or unavailing in the context of the particular statutory provisions. Thirdly, even if I were to accept that conclusion of Brennan and Toohey JJ. about the limits of Commonwealth legislative power, there would remain, for me, serious unbridged - and unbridgeable - gaps between that conclusion and the ultimate decision in Re Tracey about validity and invalidity. For one thing, it does not seem to me that there is to be found in the judgments in Re Tracey any real explanation of how, consistently with settled principles governing severance and reading down in the context of s. 15A of the Acts Interpretation Act 1901 Cth, the Court could convert what was intended by the Parliament to be an exclusionary jurisdiction to deal finally with the disciplinary and community aspects of criminal conduct into a non-exclusionary jurisdiction with the result that, depending upon the lottery of which jurisdiction is first exercised, an accused can be subjected to proceedings in both service tribunal and civil court and exposed to twice the maximum or fixed penalty which the Parliament intended. For another, I have great difficulty with the conclusion of the majority in Re Tracey that, if the provisions of the Act validly confer jurisdiction upon service tribunals to deal comprehensively with the disciplinary and community aspects of at least some service-related offences, the provisions of s. 190(3) and (5) are not valid to the extent that they deprive State courts of jurisdiction to deal with substantially the same offence after the service tribunal has exercised that comprehensive jurisdiction. If the Parliament possesses the legislative power to validly confer such comprehensive jurisdiction upon service tribunals, it seems to me to be at least incidental to the exercise of that legislative power to provide that persons tried or punished by service tribunals for the community aspects of an offence should not be again tried or punished for that aspect of the same or substantially the same offence by a State civil court. Since Amalgamated Society of Engineers v. Adelaide Steamship Co. Ltd. [1] , it is simply not to the point that an immunity from State jurisdiction conferred by a Commonwealth law as involved in, or incidental to, the establishment of comprehensive Commonwealth jurisdiction would involve a pro tanto interference with the exercise by State courts of their general criminal jurisdiction. Indeed, if s. 190(3) and (5) had not been in the Act, it seems to me that the Constitution itself, by s. 109, would necessarily have deprived a State court of jurisdiction to retry and again punish the same or substantially the same offence as that which had been comprehensively dealt with by a service tribunal in the exercise of judicial power conferred by a valid law of the Commonwealth (see per Gaudron J., Re Tracey [2] ). Fourthly, and most importantly, the reasoning which led me to the conclusion to which I came in Re Tracey reflects my understanding of the content of the separation of judicial from executive or legislative power upon which our Constitution is structured [3] .