OPINION

SMITH, J.

After their motion to suppress evidence and traverse a search warrant executed at their residence was denied, defendants and appellants Jose and Betzabe Torres withdrew their not guilty pleas to a host of criminal charges against them. Jose pleaded nolo contendere to manufacture of base cocaine (Health Saf. Code, § 11379.6) and possession of a silencer (Pen. Code, § 12520), admitting certain enhancements. His wife, Betzabe, pleaded guilty to being an accessory to possession of cocaine (Pen. Code, § 32; Health Saf. Code, § 11351). Jose was sentenced to an aggregate term of eight years in state prison. Betzabe received two years probation, including three hundred sixty days in the county jail. They appeal, availing themselves of the provisions of Penal Code section 1538.5, subdivision (m).

The primary issue confronting us is whether the San Mateo Superior Court judge erred in failing to accord collateral estoppel effect to a suppression order issued by a Los Angeles Superior Court judge on different charges, which were ultimately dismissed. We will hold that the San Mateo court was not bound by the Los Angeles ruling, but will remand the case for further findings due to the trial court's application of an erroneous standard of review.

BACKGROUND

The charges in this case stem from evidence seized pursuant to a search warrant at defendants' residence in Daly City, which was executed on September 3, 1989. The affidavit in support of the warrant incorporated a police report reciting that defendants had been arrested the night before by the California Highway Patrol (CHP) on Interstate highway 5 (I-5) north of Los Angeles with drugs in their possession. The Burbank police, who were surveilling defendants pursuant to a narcotics investigation, requested that the CHP stop defendants' vehicle in order to seek a consent search for narcotics. The truck was stopped for traveling at an excessive speed and, according to the police report, defendant Jose Torres (Jose) gave the officers permission to search the back of the truck. Forty kilograms of cocaine were recovered.

Using the information gained from the I-5 stop, police officers promptly obtained a search warrant for defendants' Daly City residence, where they recovered a large quantity of rock cocaine, $35,000 in cash, drug paraphernalia and a silencer for a handgun.

When Jose was brought up on charges of possession and possession for sale of cocaine in Los Angeles County, he moved to suppress the evidence seized in the I-5 stop. The Los Angeles County Superior Court granted the motion, finding that the CHP had no probable cause to stop the vehicle because it was not traveling in excess of 55 miles per hour. On March 21, 1990, the People declared they were unable to proceed and the Los Angeles case was dismissed.

On May 7, 1990 the district attorney in San Mateo County filed an information charging both defendants with numerous drug-related offenses based on the evidence recovered in the Daly City search.

Defendants brought a motion to "suppress evidence and to quash and traverse" the search warrant executed at their residence. Although the moving papers are not a model of clarity, the gist of defendants' arguments was that under the doctrine of collateral estoppel the San Mateo court was bound by the ruling of the Los Angeles court that the I-5 stop was illegal and that the affiant who prepared the affidavit in support of the search warrant was guilty of reckless or intentional misstatements of fact surrounding the stop ( Franks v. Delaware (1978) 438 U.S. 154, 171-172 [57 L.Ed.2d 667, 681-683, 98 S.Ct. 2674]), requiring excision of these statements from the warrant. Defendants sought to quash the warrant and thereby suppress the fruits of the Daly City search.

At the outset of the hearing on the motion, the San Mateo Superior Court judge announced that she did not consider herself bound by the ruling of the Los Angeles Superior Court suppressing the cocaine recovered in the I-5 stop, and that the entire issue would be relitigated.

The court proceeded to hear the motion. It admitted into evidence the transcript of the Los Angeles suppression hearing and also heard live witnesses on both sides, including the CHP dispatcher, the officers who participated in the I-5 stop, and both defendants. At the conclusion of the hearing the court announced that defendants had not proved by a preponderance of evidence that there was perjury or reckless misstatements in the preparation of the affidavit and denied the motion to suppress. Following this ruling, defendants pleaded guilty and pursued this appeal.

APPEAL I Collateral Estoppel

Section 1538.5, subdivision (d) (hereafter subdivision (d)) provides that, unless the People avail themselves of their appellate remedies, evidence suppressed pursuant to a section 1538.5 motion shall not be admissible against the moving party "at any trial or other hearing." Defendants claim that this section, coupled with the policy in favor of according finality to judgments and preventing vexatious litigation by prosecutors, requires that suppression rulings rendered in one county be given binding effect in other counties as well.

(2a) Collateral estoppel generally precludes relitigation of matters argued and determined in prior proceedings. The traditional prerequisites for application of the doctrine are that "`(1) the issue necessarily decided at the previous [proceeding] is identical to the one which is sought to be relitigated; (2) the previous [proceeding] resulted in a final judgment on the merits; and (3) the party against whom collateral estoppel is asserted was a party or in privity with a party at the prior [proceeding].'" ( People v. Sims (1982) 32 Cal.3d 468, 484 [ 186 Cal.Rptr. 77, 651 P.2d 321], fn. omitted, quoting People v. Taylor (1974) 12 Cal.3d 686, 691 [ 117 Cal.Rptr. 70, 527 P.2d 622].)

(1b) These requirements are fulfilled in this case. The legality of the I-5 stop is the identical issue sought to be relitigated in San Mateo County; the Los Angeles proceeding resulted in a dismissal of the charges there and the People did not appeal from that dismissal; the privity requirement was met since the party sought to be estopped in both instances is the People of the State of California.

(2b) However, the inquiry does not end here. In deciding whether to apply collateral estoppel in a criminal proceeding the court must balance the need to limit litigation against the right of a fair adversary proceeding in which a party may fully present his case. ( People v. Gephart (1979) 93 Cal.App.3d 989, 997 [ 156 Cal.Rptr. 489]; People v. Taylor, supra, 12 Cal.3d 686, 695.) The California Supreme Court recently commented that collateral estoppel may be applied to preclude criminal trials "only when compelling public policy considerations outweigh the need for determinations of guilt and innocence to be made in the usual criminal setting." ( Lucido v. Superior Court (1990) 51 Cal.3d 335, 349 [ 272 Cal.Rptr. 767, 795 P.2d 1223, 2 A.L.R.5th 995].)

The issue before us is not entirely unprecedented. In People v. Gephart, supra, 93 Cal.App.3d 989 ( Gephart), defendants, who were charged in Stanislaus County, successfully brought a section 1538.5 motion to suppress certain items of evidence, one of which was a pistol. The Stanislaus County charges were dismissed, and the People took no appeal from that ruling. Subsequently, defendants were charged with robbery in Siskiyou County and the prosecution there sought to introduce the pistol. The Siskiyou County judge refused to give binding effect to the suppression ruling in Stanislaus County, the gun was admitted into evidence, and defendants were convicted.

On appeal from the judgment, Justice Reynoso, writing for the court, held that an order suppressing evidence in one county will not preclude relitigation of the same suppression issue when the defendant is faced with unrelated charges in a different county. Noting that the determination of a section 1538.5 motion is a preliminary question independent of the accused's guilt and that prosecutorial discretion in deciding whether to prosecute or dismiss is wide and may vary from county to county according to a number of considerations, the Gephart court concluded, "We do not believe that the Legislature intended to give the [section 1538.5] determination conclusive effect beyond the proceedings in which the defendant is involved at the time of the determination. The purposes of Penal Code section 1538.5 would be fully served without such effect in subsequent prosecutions on different charges." (93 Cal.App.3d at p. 999.)

Defendants maintain that Gephart is distinguishable because the charges there were unrelated, whereas both sets of charges here arose from a single narcotics operation targeted at them and conducted jointly by northern and southern California law enforcement authorities. Defendants also criticize the "sweeping language" of Gephart to the effect that section 1538.5 rulings can never have collateral estoppel effect beyond the proceeding in which they are made; they claim such language is inconsistent with subdivision (d) and subsequent cases, some of which are from the same district.

A fair reading of Gephart, however, shows that the court did not premise its holding on the relatedness or unrelatedness of the charges. Rather, the paramount concern was the unfairness to the prosecutor in County A of preventing him from litigating a suppression issue simply because of a prior discretionary decision by the prosecutor in County B not to challenge an adverse ruling pertaining to a different charge, especially when the decision in County B may have had little or nothing to do with the merits of the ruling.

Later cases have confirmed an interpretation of Gephart consistent with this view. "[ Gephart held] that a section 1538.5 suppression order is not binding on the prosecutor of a different county on different charges. . . ." ( People v. Workman (1989) 209 Cal.App.3d 687, 700-701 [ 257 Cal.Rptr. 753], italics added.) "Findings made on a . . . section 1538.5 motion to dismiss are not binding on a court considering dismissal of different charges based on different crimes." ( People v. Huston (1989) 210 Cal.App.3d 192, 225 [ 258 Cal.Rptr. 393], italics added.) "[W]here the subsequent filing or case is in a different county and/or the charges are not identical, a previously suppressed item of evidence may be introduced albeit it may be the same evidence resulting from the same search or seizure." ( People v. Methey (1991) 227 Cal.App.3d 349, 356 [ 277 Cal.Rptr. 777].)

Defendants claim People v. Zimmerman (1979) 100 Cal.App.3d 673 [ 161 Cal.Rptr. 188] ( Zimmerman), should control this case. In Zimmerman, defendant was arrested and charged in Santa Clara County with possession of LSD and possession of a firearm. At the preliminary hearing, the fruits of a search of the defendant were suppressed and the charges dismissed. Subsequently, the Contra Costa Superior Court modified the defendant's probation based on the same LSD and firearm possession charges brought in Santa Clara County. In a brief opinion, Division Three of this court reversed, holding that subdivision (d) precluded use of the evidence which had been suppressed in the prior criminal proceeding. (100 Cal.App.3d at p. 676.)

The key distinction is that in Zimmerman the offenses which the defendant faced in the Contra Costa County revocation proceeding were the precise charges which were dismissed in the prior criminal action. Here the prosecutions involved different offenses committed in different jurisdictions and based on different evidence.

For these reasons, Dyson v. State Personnel Bd. (1989) 213 Cal.App.3d 711 [ 262 Cal.Rptr. 112] (State Personnel Board collaterally estopped from bringing disciplinary action based on evidence suppressed in prior criminal action) and Buttimer v. Alexis (1983) 146 Cal.App.3d 754 [ 194 Cal.Rptr. 603] (Dept. of Motor Vehicles may not revoke license based on arrest ruled illegal in prior criminal proceeding), both of which are cited by defendants, are not persuasive. In those cases an administrative agency was not permitted to relitigate the same charges which had been quashed as a result of a successful section 1538.5 motion in a court of law. (1c) Furthermore, while there are strong policy reasons in favor of precluding administrative tribunals from readjudicating issues that have already been decided in prior judicial proceedings, no equally compelling policy reasons demand that one superior court, considering new charges in its own jurisdiction, be constrained to follow another superior court's preliminary evidentiary ruling which does not directly bear on an accused's guilt or innocence.

Recent case law supports our determination that collateral estoppel should not apply here. In People v. Workman, supra, 209 Cal.App.3d 687 ( Workman), a magistrate granted a suppression motion at the preliminary hearing and the charges were dismissed. The prosecutor did not appeal from the ruling, but merely filed a new complaint with additional charges based on the same transactions as the original complaint. The second magistrate refused to give collateral estoppel effect to the first suppression ruling and defendants eventually pleaded guilty to some of the charges. In upholding the convictions, the Workman court held that subdivision (d) did not compel the second court to give collateral estoppel to effect the first magistrate's ruling. The court not only relied on section 1538.5, subdivision (j) but adopted Gephart's conclusion that the Legislature did not intend to give a suppression ruling conclusive effect "` beyond the proceedings in which the defendant is involved at the time of the determination.'" (209 Cal.App.3d at p. 701, italics added, quoting Gephart, supra, 93 Cal.App.3d at p. 999.)

In People v. Methey, supra, 227 Cal.App.3d 349, the court narrowed the application of subdivision (d) even further. Methamphetamine was found during a pat-search of the defendant. On a prosecution for possession, the superior court granted a motion to suppress the evidence and the charges were dismissed. Pursuant to its authority under section 1387, the prosecution reinstated the complaint and filed a new information in superior court. This time the defendant's motion to suppress was denied. The Court of Appeal affirmed the judgment. Noting that under Workman the People may dismiss at the preliminary hearing and then refile without being bound by a prior suppression ruling, Methey concluded that there is no logical reason why the prosecution should be unable to relitigate a suppression ruling simply because the first charge was dismissed at the superior court level. The court held that subdivision (d)'s prohibition on the use of suppressed evidence "`at any trial or hearing'" referred only "to any trial or hearing resulting from the charging documents then before the court." (227 Cal.App.3d at p. 354.) In reaching this conclusion the court also took cognizance of the line of cases beginning with Gephart "holding that where the subsequent filing or case is in a different county and/or the charges are not identical, a previously suppressed item of evidence may be introduced albeit it may be the same evidence resulting from the same search or seizure." ( Id., at p. 356, italics added.) The California Supreme Court denied a petition for review in Methey. Gephart's interpretation of subdivision (d), first articulated in 1979, has thus been recently reaffirmed in both Workman and Methey. We conclude that a suppression ruling resulting in a dismissal of charges at a preliminary stage in one county should not preclude litigation of the validity of a search or seizure where the defendant faces new and separate criminal charges in a different jurisdiction.

We do not share defendants' concern that this conclusion sanctions harassment of defendants or "forum shopping" by prosecutors. This is not a situation where the prosecutor dismisses the case in one county and brings it to another in the hope of receiving more favorable treatment. Nor is there any suggestion that the San Mateo district attorney had any control or knowledge of the proceedings in Los Angeles County which led to the dismissal of the cocaine charges there. Fundamental fairness and the public policy in favor of litigating questions of guilt or innocence on their merits outweigh the need for consistency in a situation where the defendants face new and separate charges in another county.

The trial court committed no error in refusing to abide by the suppression ruling in Los Angeles County.

II Procedural Error

(3) Defendants next argue that even if the court was not bound to honor the suppression ruling of the Los Angeles court, it erred by directly adjudicating the Franks issue of whether or not there were reckless or false misstatements in the search warrant affidavit instead of first determining the legality of the I-5 stop and search. We agree.

Defendants correctly point out that if the I-5 search was illegal the observations gained therefrom must be stricken and the affidavit retested for probable cause. ( People v. Koch (1989) 209 Cal.App.3d 770, 774 [ 257 Cal.Rptr. 483].) Since the prosecutor below conceded that the search warrant would not provide probable cause to search if the fruits of the I-5 search were suppressed, one might expect defendants' trial counsel to have advanced a fruit-of-the-poisonous-tree argument to invalidate the warrant, rather than subjecting defendants to the much more stringent Franks test of whether the affidavit contained intentionally false or deceptive facts.

Nevertheless, the main premise of the suppression motion was that the warrant was defective because the affiant officer filled it with intentional or recklessly false statements regarding the existence of probable cause to stop and defendants' asserted consent to the I-5 search. Defendants only indirectly attacked the warrant as the product of illegally obtained evidence.

Responding to the focus of defendants' arguments, the judge repeatedly made comments to the effect that she was resolving the matter strictly as a Franks motion. Indeed, at the conclusion of the hearing Judge Kosloski stated, "The court rules that the defendant has not proved the allegations that there was perjury or reckless disregard for the truth . . . ." (Italics added.)

While the court's actions were understandable in light of defendants' emphasis on the Franks issue, there was no justification for its failure to address the threshold question of whether the I-5 stop and search were reasonable in the first instance. (4) The error was prejudicial because the allocation of the burden of proof with respect to the two issues is not only different but diametrically opposite. In a motion to suppress the fruits of a warrantless search, the burden is on the prosecution to prove by a preponderance of the evidence that the detention and search were justified. ( People v. Huntsman (1984) 152 Cal.App.3d 1073, 1086 [ 200 Cal.Rptr. 89]; see People v. Boragno (1991) 232 Cal.App.3d 378, 386 [ 283 Cal.Rptr. 452].) In a Franks motion, the search warrant is presumptively valid and the burden falls on the defendant to show that it contained deliberately or recklessly false statements. ( People v. Costello (1988) 204 Cal.App.3d 431, 440-441 [ 251 Cal.Rptr. 325], quoting Franks v. Delaware, supra, 438 U.S. 154, 171-172 [57 L.Ed.2d 667, 681-683].) Since the court only adjudicated the motion under the more stringent Franks standard, the error cannot be deemed harmless.

Defendants were entitled to a judicial determination of whether the People sustained their burden of proving the reasonableness of the I-5 search independent of any consideration of the Franks issue. We disagree however with their suggestion that a new evidentiary hearing be held. The court has already conducted a full hearing in which it heard evidence and argument by both sides on the validity of the detention and search. All it need do at this point is to employ a two-step rather than a one-step process in ruling on the motion: (1) determine whether the I-5 stop and warrantless search were valid, and (2) decide whether, under Franks, the affidavit for the San Mateo County search warrant contained false or reckless misstatements. If so, the court should strike them and retest the affidavit for probable cause.

DISPOSITION

The judgments are reversed. The cause is remanded to the superior court with directions to make appropriate findings on defendants' suppression motion in accordance with the views expressed herein.

If the court grants the motion to suppress in all or in part it shall vacate the judgments and give the defendants the opportunity to withdraw their guilty pleas. If the court denies the motion, it shall reinstate the judgments. (See People v. Miller (1983) 33 Cal.3d 545, 553-556 [ 189 Cal.Rptr. 519, 658 P.2d 1320].)

Peterson, J., concurred.