delivered the opinion of the court:
F ollowing a denial of a motion to quash a search warrant and to suppress evidence, defendant, Herbert Laws, Jr., and the prosecution entered into a stipulation of facts from which the circuit court of Cook County, in a bench trial, found the defendant guilty of possession of a controlled substance. The defendant filed a notice of appeal. Several months after the defendant appealed his conviction, the United States Supreme Court rendered its decision in Franks v. Delaware (1978), 438 U.S. 154, 57 L. Ed. 2d 667, 98 S. Ct. 2674. Franks holds that, under certain circumstances, a defendant may challenge the veracity of sworn statements made in support of a search warrant. The defendant contended in the appellate court that the holding in Franks is applicable to his case and requires a reversal. The appellate court, with one justice dissenting, finding that Franks had retroactive application, reversed the conviction and remanded the cause to the circuit court of Cook County for a hearing as to the veracity of the sworn complaint for a search warrant. (82 Ill. App. 3d 417.) We granted the State leave to appeal under our Rule 315. 73 Ill. 2d R. 315.
On August 21, 1976, Officer Glenn Rosiak applied to a judge of the circuit court of Cook County for a warrant to search Herbert Laws, Jr., a female named Mary, and the second-floor apartment at 5617 South Calumet Avenue in Chicago. The officer’s sworn complaint stated in substance the following: The officer had several conversations with a known informant of proved reliability. During these conversations, the informant told the officer that he had been purchasing heroin from “Herbie Jr.” two or three times weekly for approximately three months. The officer stated that after showing a photograph of Herbert Laws, Jr., to the informant, the informant identified the person in the photograph as Herbie Jr. The officer stated that he *496next established a surveillance of 5617 Calumet Avenue. During that time, which lasted just over an hour, he observed several known addicts enter and, shortly thereafter, leave the building. The judge found that probable cause existed to issue the search warrant.
A search was conducted pursuant to the warrant, producing heroin, cocaine, cannabis, and several firearms. The defendant was charged with possession of a controlled substance. (Ill. Rev. Stat. 1975, ch. 561/2, par. 1402.) Prior to trial, the defendant filed a written motion to quash the search warrant and suppress the evidence. He requested a hearing, alleging that the search warrant was issued upon false statements contained in the sworn complaint. The defendant alleged that the conversations related by the officer never transpired and that the surveillance, as well as the existence of the informant, were merely fabrications of the officer.
The motion was denied on December 15, 1977. Based on People v. Bak (1970), 45 Ill. 2d 140, the judge concluded that a defendant could not go beyond the four corners of the warrant in questioning its veracity. Thus, no hearing on the motion was held.
As noted above, the search warrant in our case was issued August 21, 1976. In June of 1978 the United States Supreme Court announced its decision in Franks v. Delaware (1978), 438 U.S. 154, 57 L. Ed. 2d 667, 98 S. Ct. 2674. Under Franks, a defendant may have a hearing to challenge the veracity of a warrant if certain requirements are met:
“To mandate an evidentiary hearing, the challenger’s attack must be more than conclusory and must be supported by more than a mere desire to cross-examine. There must be allegations of deliberate falsehood or of reckless disregard for the truth, and those allegations must be accompanied *497by an offer of proof. They should point out specifically the portion of the warrant affidavit that is claimed to be false; and they should be accompanied by a statement of supporting reasons. Affidavits or sworn or otherwise reliable statements of witnesses should be furnished, or their absence satisfactorily explained. Allegations of negligence or innocent mistake are insufficient. The deliberate falsity or reckless disregard whose impeachment is permitted today is only that of the affiant, not of any nongovernmental informant. Finally, if these requirements are met, and if, when material that is the subject of the alleged falsity or reckless disregard is set to one side, there remains sufficient content in the warrant affidavit to support a finding of probable cause, no hearing is required.” (Franks v. Delaware (1978), 438 U.S. 154, 171-72, 57 L. Ed. 2d 667, 682, 98 S. Ct. 2674, 2684.)
The appellate court, finding that Franks should be given retroactive application, reversed the defendant’s conviction and remanded this cause to the trial court for a hearing on the earlier motion.
Two issues are argued before this court. The first, is whether the Franks decision should be given retroactive application so that the defendant’s case would qualify for a hearing on the veracity of the officer’s sworn statements. The second, is whether the allegations of the defendant are sufficient to satisfy the requirements of Franks, if it is found to be retroactive.
It has been well established in this State that a defendant may not impeach the veracity of the sworn statements upon which a search warrant was issued. (People v. Bak (1970), 45 Ill. 2d 140; People v. Mitchell (1970), 45 Ill. 2d 148; People v. Berry (1970), 46 Ill. 2d 175; People v. *498 Price (1970), 46 Ill. 2d 209; People v. Nakon (1970), 46 Ill. 2d 561; People v. Stansberry (1971), 47 Ill. 2d 541.) As noted above, the Supreme Court in Franks, although not announcing a broad rule concerning the right to challenge the truthfulness of such sworn statements, did hold that an absolute ban upon post-search impeachment of veracity is not justified. The court in Franks also noted the substantial division of authority which, at that time, existed on the question. The Supreme Court did not address the subject of the retroactivity of its holding in Franks, which was decided June 26, 1978. Inasmuch as the search warrant in our case was issued August 21, 1976, and the defendant’s motion to suppress was denied on December 15, 1977, Franks is relevant only if its holding has retroactive application.
At common law there was no authority to support the proposition that judicial decisions were to be applied prospectively only. Under what has come to be known as Blackstonian reasoning, the courts did not pronounce or make new law, but rather declared or discovered existing law. (See 3 W. LaFave, Search & Seizure sec. 11.5, at 681 (1978); Schaefer, The Control of Sunbursts: Techniques of Prospective Overruling, 42 N.Y.U. L. Rev. 631 (1967).) However, in Great Northern R.R. Co. v. Sunburst Oil & Refining Co. (1932), 287 U.S. 358, 77 L. Ed. 360, 53 S. Ct. 145, it was held that a State court, in defining the limits of adherence to precedent, may make a choice for itself between prospective and retroactive application of its decision. There is no constitutional mandate requiring or prohibiting retroactive application of judicial pronouncements of new constitutional rules. Linkletter v. Walker (1965), 381 U.S. 618, 14 L. Ed. 2d 601, 85 S. Ct. 1731; Johnson v. New Jersey (1966), 384 U.S. 719, 16 L. Ed. 2d 882, 86 S. Ct. 1772; Desist v. United States (1969), 394 U.S. 244, 22 L. Ed. 2d 248, 89 S. Ct. 1030.
The choice between retroactive and nonretroactive *499application does not depend upon the value of the constitutional guarantee involved and is not automatically determined by the provisions of the constitution under consideration. (Johnson v. New Jersey (1966), 384 U.S. 719, 728-29, 16 L. Ed. 2d 882, 889-90, 86 S. Ct. 1772, 1778-79.) In Linkletter v. Walker the court stated:
“[W] e must then weigh the merits and demerits in each case by looking to the prior history of the rule in question, its purpose and effect, and whether retrospective operation will further or retard its operation. We believe that this approach is particularly correct with reference to the Fourth Amendment’s prohibitions as to unreasonable searches and seizures.” (Linkletter v. Walker (1965), 381 U.S. 618, 629, 14 L. Ed. 2d 601, 608,85 S. Ct. 1731, 1738.)
While the question of retroactive application of a new constitutional rule will be resolved on the merits of each holding, certain factors have been the focal point of consideration. (See generally Annot., 22 L. Ed. 2d 821 (1970).) In Stovall v. Denno (1967), 388 U.S. 293, 18 L. Ed. 2d 1199, 87 S. Ct. 1967, the court stated:
“The criteria guiding resolution of the question implicate (a) the purpose to be served by the new standards, (b) the extent of the reliance by law enforcement authorities on the old standards, and (c) the effect on the administration of justice of a retroactive application of the new standards.” (Stovall v. Denno (1967), 388 U.S. 293, 297,
18 L. Ed. 2d 1199, 1203, 87 S. Ct. 1967, 1970.) Although the extent of reliance on the former holdings and the effect of retroactive application on the administration of justice are acknowledged as worthy of consideration, foremost among the factors to be considered is the purpose to be served by the new standards. (Desist v. United States (1969), 394 U.S. 244, 249, 22 L. Ed. 2d *500248, 255, 89 S. Ct. 1030, 1033-34.) In Desist the court noted the extent to which the other two factors will be considered by stating:
“It is to be noted also that we have relied heavily on the factors of the extent of reliance and consequent burden on the administration of justice only when the purpose of the rule in question did not clearly favor either retroactivity or prospectivity.” Desist v. United States (1969), 394 U.S. 244, 251, 22 L. Ed. 2d 248, 256, 89 S. Ct. 1030, 1035.
In Desist the court considered whether the purpose of excluding evidence because of fourth amendment violations required retroactive application of the holding in Katz v. United States (1967), 389 U.S. 347, 19 L. Ed. 2d 576, 88 S. Ct. 507. The court, in holding that Katz would not be applied retroactively, noted that all of the cases requiring the exclusion of illegal evidence have been based on the necessity for an effective deterrent to illegal police action. The court observed that the cases have held that the purpose would not be advanced by applying the rule retroactively. The misconduct of the police in the other cases had already occurred and would not be corrected by applying the new rule to those cases. The court also noted that, in contrast with decisions that have been accorded retroactive effect, there is no likelihood of unreliability or coercion in a search-and-seizure case; that the exclusionary rule is but a procedural weapon that has no bearing on guilt; and that the fairness of the trial is not in such cases under attack. (Desist v. United States (1969), 394 U.S. 244, 249, 22 L. Ed. 2d 248, 255, 89 S. Ct. 1030, 1033-34.) It has been stated that the reliance and effect-on-administration-of-justice factors are at least relatively minor considerations and that nonretroactivity in the fourth amendment area must primarily be justified, if at all, under the purpose factor. Since the purpose of the exclusionary rule as stated in Elkins v. United States *501(1960), 364 U.S. 206, 4 L. Ed. 2d 1669, 80 S. Ct. 1437, is calculated to prevent, not to repair, “then the rule of nonretroactivity in Fourth Amendment cases makes a good deal of sense.” (3 W. LaFave, Search & Seizure sec. 11.5, at 687 (1978).) Professor LaFave states that the holdings of the Supreme Court in Linkletter, Desist, and Williams v. United States (1971), 401 U.S. 646, 28 L. Ed. 2d 388, 91 S. Ct. 1148, will result in any new fourth amendment doctrines favorable to defendant being applied in prospective fashion. 3 W. LaFave, Search & Seizure sec. 11.5, at 685 (1978).
The application of the exclusionary rule for fourth amendment violations must be contrasted with the application of new constitutional holdings whose purpose is to safeguard and insure the integrity of the truth-finding function of a trial: *502See also Johnson v. New Jersey, United States v. United States Coin & Currency (1971), 401 U.S. 715, 730, 28 L. Ed. 2d 434, 444, 91 S. Ct. 1041, 1049 (White, J., dissenting); Stovall v. Denno (1967), 388 U.S. 293, 18 L. Ed. 2d 1199, 87 S. Ct. 1967.
*501“Where the major purpose of new constitutional doctrine is to overcome an aspect of the criminal trial that substantially impairs its truth-finding function and so raises serious questions about the accuracy of guilty verdicts in past trials, the new rule has been given complete retroactive effect. Neither good-faith reliance by state or federal authorities on prior constitutional law or accepted practice, nor severe impact on the administration of justice has sufficed to require prospective application in these circumstances.
It is quite different where the purpose of the new constitutional standard proscribing the use of certain evidence or a particular mode of trial is not to minimize or avoid arbitrary or unreliable results but to serve other ends. In these situations the new doctrine raises no question about the guilt of defendants convicted in prior trials.” (Williams v. United States (1971), 401 U.S. 646, 653, 28 L. Ed. 2d 388, 395, 91 S. Ct. 1148, 1152-53.)
*502Defendant relies heavily on United States v. Peltier (1975), 422 U.S. 531, 45 L. Ed. 2d 374, 95 S. Ct. 2313, wherein the court, in considering the retroactive application of the exclusionary rule, discussed not only the purpose of the rule but also the question of whether there was good-faith reliance on the part of law-enforcement officers with the then-prevailing constitutional holdings that were later overturned by the court. The defendant contends that the officer’s conduct in intentionally swearing to false statements made in support of a search warrant cannot be considered good-faith reliance. Thus, the defendant contends the “imperative of judicial integrity” requires that the holding of Franks be applied to his case.
Although Peltier discussed the “imperative of judicial integrity,” it did not depart from the holdings of earlier cases discussed above. In Peltier the court noted that while the “imperative of judicial integrity” played a role in the court’s decision in Mapp v. Ohio (1961), 367 U.S. 643, 6 L. Ed. 2d 1081, 81 S. Ct. 1684, which overruled Wolf v. Colorado (1949), 338 U.S. 25, 93 L. Ed. 1782, 69 S. Ct. 1359, the Mapp decision was denied retroactive application in Linkletter. (422 U.S. 531, 536, 45 L. Ed. 2d 374, 380-81, 95 S. Ct. 2313, 3317.) The court in Peltier also noted that in Lee v. Florida (1968), 392 U.S. 378, 20 L. Ed. 2d 1166, 88 S. Ct. 2096, which overruled Schwartz v. Texas (1952), 344 U.S. 199, 97 L. Ed. 231, 73 S. Ct. 232, the court, buttressing its holding by the “imperative of judicial integrity” principle, stated that under our constitution no court may serve as an accomplice in the wrongful transgression of the law. (422 U.S. 531, 536-37, 45 L. Ed. 2d 374, 381, 95 S. Ct. 2313, *5032317.) Peltier pointed out, however, that when it came time to consider the retroactivity of Lee, the court held that it did not apply retroactively. (422 U.S. 531, 536-37, 45 L. Ed. 2d 374, 381, 95 S. Ct. 2313, 2317. See Fuller v. Alaska (1968), 393 U.S. 80, 21 L. Ed. 2d 212, 89 S. Ct. 61.) Peltier summarized the holdings of these cases thus:
“The teaching of these retroactivity cases is that if the law enforcement officers reasonably believed in good faith that evidence they had seized was admissible at trial, the “imperative of judicial integrity” is not offended by the introduction into evidence of that material even if decisions subsequent to the search or seizure have broadened the exclusionary rule to encompass evidence seized in that manner.” (Peltier v. United States (1975), 422 U.S. 531, 537, 45 L. Ed. 2d 374, 381, 95 S. Ct. 2313, 2317.)
The court in Peltier then restated the purpose doctrine by quoting from Desist, “[W]e simply decline to extend the court-made exclusionary rule to cases in which its deterrent purpose would not be served.” (422 U.S. 531, 538, 45 L. Ed. 2d 374, 382, 95 S. Ct. 2313, 2318.) Peltier plainly did not abandon the purpose doctrine of Desist in favor of the “imperative of judicial integrity” doctrine in determining whether the new pronouncement should be retroactively applied.
The purpose of the exclusionary rule has no bearing on guilt or innocence, and the question of the fairness of the trial is not involved. Thus exclusion retroactively applied does not serve to insure the integrity of the fact-finding process. The deterrent purpose of the exclusionary rule would not be furthered by applying the holding of Franks to searches and seizures that have long since been completed.
It may be argued that Franks did not announce a new *504rule, in that the Supreme Court had never before considered the right to impeach the veracity of the sworn statements upon which a search warrant issued. Therefore, it could be argued, the nonretroactive holdings of the cases above discussed do not apply. However, in Peltier there had been no prior approval of roving border-patrol searches by the Supreme Court. Almeida-Sanchez v. United States (1973), 413 U.S. 266, 37 L. Ed. 2d 596, 93 S. Ct. 2535, was the first border-patrol-search case decided by the Supreme Court, and it held such warrantless searches unconstitutional. However, Peltier declines to apply this ruling retroactively, since there had been prior administrative and judicial approval of such procedure. Peltier held that the parties could reasonably rely on legal pronouncements emanating from sources other than the Supreme Court. 422 U.S. 531, 541-42, 45 L. Ed. 2d 374, 383-84, 95 S. Ct. 2313, 2319-20.
The law had been well established in Illinois in the cases previously cited that the veracity of the sworn statements supporting search warrants could not be impeached. Those cases reasoned that a judicial officer had found that there was probable cause to issue the warrant, and that the credibility of the affiant had been determined by the judicial officer issuing the warrant and should not be later impeached. Under Illinois law prior to Franks, the defendant’s constitutional right had not been violated. The search and seizure had been conducted by officers in reliance upon a search warrant which, under the law of this State at that time, was valid and had been properly issued.
Thus, Franks was a departure from the prior law as it existed in this State. The officers conducting the search based on the warrant issued could rely on the prior legal pronouncements of this court just as Peltier held that the officers could rely on legal pronouncements emanating *505from sources other than the Supreme Court.
A closely analogous situation to that in Franks was presented to the court of appeals in United States ex rel. Pugh v. Pate (7th Cir. 1968), 401 F.2d 6, wherein it was held that a fictitious name on an affidavit to a search warrant rendered the warrant invalid. In United States ex rel. Smith v. Pate (N.D. Ill. 1969), 305 F. Supp. 225, and in United States ex rel. Mayfield v. Pate (N.D. Ill. 1969), 305 F. Supp. 41, the district court refused to give retroactive application to the holding in Pugh.
Aside from the reasons stated above, the nature of the holding in Franks would seem to require that it be applied prospectively only. Although Franks held that an absolute ban on post-search impeachment of the search warrant affidavit is not justified, it did not hold that a defendant may in all cases challenge the veracity of the sworn statements. The opinion in Franks provides for evidentiary hearings on challenges to the truthfulness of the statements only if certain specific conditions are met. The court thus did not permit indiscriminate challenges to the truthfulness of such statements. It instead fashioned a procedural remedy by which defendants can challenge the sworn allegations. We have set out this procedure earlier in this opinion. These procedural requirements had not existed before Franks, and being procedural in nature, it would appear that the remedy should be applied prospectively. The remedy did not exist previously. It would be difficult, if not impossible, to apply this remedy to searches authorized by warrants issued prior to the holding in Franks.
Since we have held that the holding in Franks cannot be applied retroactively to this case, we need not consider whether defendant’s allegations are such as to entitle him to a hearing under Franks.
For the above reasons the judgment of the appellate *506court is reversed, and the judgment of the circuit court of Cook County is affirmed.
Appellate court reversed; circuit court affirmed.