As a unanimous High Court said in George v Rockett [1990] HCA 26; (1990) 170 CLR 104 ("George v Rockett") at 110:
A search warrant ... authorizes an invasion of premises without the consent of persons in lawful possession or occupation thereof. The validity of such a warrant is necessarily dependent upon the fulfilment of the conditions governing its issue. In prescribing conditions governing the issue of search warrants, the legislature has sought to balance the need for an effective criminal justice system against the need to protect the individual from arbitrary invasions of his privacy and property. Search warrants facilitate the gathering of evidence against, and the apprehension and conviction of, those who have broken the criminal law. In enacting s. 679 [of the Queensland Criminal Code], the legislature has given primacy to the public interest in the effective administration of criminal justice over the private right of the individual to enjoy his privacy and property.
Their Honours noted at 110-111:
State and Commonwealth statutes have made many exceptions to the common law position, and s. 679 is a far-reaching one. Nevertheless, in construing and applying statutes, it needs to be kept in mind that they authorize the invasion of interests which the common law has always valued highly and which, through the writ of trespass, it went to great lengths to protect. Against that background, the enactment of conditions which must be fulfilled before a search warrant can be lawfully issued and executed is to be seen as a reflection of the legislature's concern to give a measure of protection to these interests. To insist on strict compliance with the statutory conditions governing the issue of search warrants is simply to give effect to the purpose of the legislation.
Brennan J (as he then was) observed in Alister v The Queen (1983-1984) 154 CLR 404 at 456:
It is of the essence of a free society that a balance is struck between the security that is desirable to protect society as a whole and the safeguards that are necessary to ensure individual liberty. But in the long run the safety of a democracy rests upon the common commitment of its citizens to the safeguarding of each man's liberty, and the balance must tilt that way: cf Sankey v. Whitlam (1978) 142 CLR, at 42, 61-62.
This emphasis on strict compliance with the "statutory conditions governing the issue of search warrants" and, I add, their execution, approaches quite closely the constitutional safeguard of "due process" in American jurisprudence. It is compatible with an important observation by Barwick CJ in The Queen v Ireland [1970] HCA 21; (1970) 126 CLR 321 at 334-5, where the Chief Justice expressed the view that evidence obtained in breach of statute would more readily warrant the rejection of the evidence than where there has been unlawfulness deriving from the requirements of the common law:
Evidence of relevant facts or things ascertained or procured by means of unlawful or unfair acts is not, for that reason alone, inadmissible. This is so, in my opinion, whether the unlawfulness derives from the common law or from statute. But it may be that acts in breach of a statute would more readily warrant the rejection of the evidence as a matter of discretion: or the statute may on its proper construction itself impliedly forbid the use of facts or things obtained or procured in breach of its terms. On the other hand evidence of facts or things so ascertained or procured is not necessarily to be admitted, ignoring the unlawful or unfair quality of the acts by which the facts sought to be evidenced were ascertained or procured. Whenever such unlawfulness or unfairness appears, the judge has a discretion to reject the evidence. He must consider its exercise. In the exercise of it, the competing public requirements must be considered and weighed against each other. On the one hand there is the public need to bring to conviction those who commit criminal offences. On the other hand there is the public interest in the protection of the individual from unlawful and unfair treatment. Convictions obtained by the aid of unlawful or unfair acts may be obtained at too high a price. Hence the judicial discretion.