OPINION

BROWN (Gerald), P.J.

The People have petitioned under Penal Code section 1538.5, subdivision (o) for a writ of prohibition or mandate to compel reversal of an order granting the motion of defendant Linda Harris to suppress evidence.

(1a) The issue presented is whether the decision in People v. Zelinski, 24 Cal.3d 357 [ 155 Cal.Rptr. 575, 594 P.2d 1000], should have retroactive application, other than to Zelinski herself. That case held California Constitution article I, section 13, protecting against unreasonable searches, and the exclusionary rule which implements it, now applies to unlawful searches by private security guards when they are not acting in a purely private capacity, for example, recovering stolen merchandise, but rather are "fulfilling a public function in bringing violators of the law to public justice." ( People v. Zelinski, supra, 24 Cal.3d 357, 366.)

A private store detective working for Robinson's department store apprehended Harris and codefendant Kevin Harris, her husband, after they were seen shoplifting earrings in the jewelry accessory department and putting the earrings into pouches. The detective searched the pouches and recovered some 35 pairs of stolen earrings. The parties agree the searches were beyond the authority of a private security officer (Pen. Code, § 490.5; see also People v. Sandoval, 65 Cal.2d 303, 311, fn. 5 [ 54 Cal.Rptr. 123, 419 P.2d 187]) and therefore under Zelinski the earrings should be excluded from evidence provided that case applies to searches conducted before the opinion in Zelinski was filed. The trial court ruled Zelinski applies in nonfinal cases and ordered the seized earrings suppressed as to Linda Harris.

Earlier decisions held the exclusionary rule did not apply to the fruits of private citizen searches ( Dyas v. Superior Court, 11 Cal.3d 628, 632 [ 114 Cal.Rptr. 114, 522 P.2d 674]; People v. McKinnon, 7 Cal.3d 899, 912 [ 103 Cal.Rptr. 897, 500 P.2d 1097]) unless the private citizen acted in concert with a state police officer or at his direction ( People v. McKinnon, supra, 7 Cal.3d at p. 912). Decisions exempted store security personnel from the exclusionary rule as recently as 1976 ( People v. Moreno, 64 Cal.App.3d Supp. 23, 28 [135 Cal.Rptr. 340]; cf. also People v. Mangiefico, 25 Cal.App.3d 1041, 1047-1048 [ 102 Cal.Rptr. 449] [insurance company fire investigator]; People v. Houle, 13 Cal.App.3d 892 [ 91 Cal.Rptr. 874] [bail bondsman]).

Zelinski is thus a departure from earlier law, as the court itself recognizes. ("We have excluded the fruits of . . . illegal investigations [by private security personnel] only when they were acting in concert with the police. . . ." People v. Zelinski, supra, 24 Cal.3d 357, 365.)

The Supreme Court's reason for the new rule is deterrence of illegal security guard conduct. ( Id. at p. 366.) The decision does not discuss retroactivity. The exclusionary rule has no bearing on guilt nor the reliability of the fact-finding process ( In re Johnson, 3 Cal.3d 404, 412 [ 90 Cal.Rptr. 569, 475 P.2d 841]). Retroactive application of Zelinski does not further its deterrence rationale.

Here defendant contends we deal with a pretrial writ of review and we should apply the Zelinski rule retroactively in order to conduct the trial according to most recent legal standards. In our view, however, Zelinski should not be applied retroactively. As pointed out in People v. Kaanehe, 19 Cal.3d 1, 10 [ 136 Cal.Rptr. 409, 559 P.2d 1028], "[d]ecisions have generally been made fully retroactive only where the right vindicated is one which is essential to the integrity of the fact-finding process. On the other hand, retroactivity is not customarily required when the interest to be vindicated is one which is merely collateral to a fair determination of guilt or innocence." (See also, In re Johnson, supra, 3 Cal.3d 404, 410-413.) Recent California Supreme Court cases have applied changes in the law surrounding the exclusionary rule prospectively. (E.g., People v. Ramey, 16 Cal.3d 263, 276, fn. 7 [ 127 Cal.Rptr. 629, 545 P.2d 1333]; People v. Kaanehe, supra, 19 Cal.3d 1, 9-10 [applying rule of Burrows v. Superior Court, 13 Cal.3d 238 ( 118 Cal.Rptr. 166, 529 P.2d 590), only to records seized after Burrows became final]; People v. Cook, 22 Cal.3d 67, 99, fn. 18 [ 148 Cal.Rptr. 605, 583 P.2d 130] [applying its rule only to searches conducted after Cook became final].) The federal rule is similar ( Desist v. United States, 394 U.S. 244, 249-250 [22 L.Ed.2d 248, 255, 89 S.Ct. 1030]). Further, the recent decision in In re Perrone C., 26 Cal.3d 49 [ 160 Cal.Rptr. 704, 603 P.2d 1300], limits to the appellant in that case the retroactive effect of its holding regarding unconstitutionality of hearings before a juvenile referee, although that decision articulated a fundamental right to a fair trial consistent with due process, a consideration not only relevant but integral to the fact-finding process. (2) (See fn. 2.) A fortiori, the rule in Zelinski should not apply retroactively.

Defendant argues Zelinski should be retroactively applied because it was foreshadowed by earlier decisions which either referred to the potential threat of private security searches or developed the doctrine requiring exclusion where the private personnel acted in concert with police. We think these cases "foreshadowed" Zelinski in no different sense than any new rule of law owes its being to earlier thoughts and developments which paved the way for change. Responsible judicial decisions do not usually spring from a vacuum. We think the important question is not the extent to which Zelinski rests on precedent, but rather, the question what valid goals its retroactive application would serve, keeping in mind application of the exclusionary rule prevents use of reliable, valid evidence. (1b) We conclude the only reason for the rule is deterrence of illegal conduct, which cannot be aided by retroactive application.

Let a peremptory writ of mandate issue directing the superior court to vacate its order granting defendant Linda Harris' motion to suppress evidence, and to enter a new and different order denying that motion and admitting the evidence which was the subject of the motion. Further proceedings in the trial of Linda Harris shall be stayed until the earlier of the court's compliance with our writ or the date this decision shall become final.

Cologne, J., and Staniforth, J., concurred.

The petition of real party in interest for a hearing by the Supreme Court was denied February 20, 1980.