*111 Opinion
The Department of Motor Vehicles (DMV) appeals a superior court judgment issuing a writ directing DMV to vacate its order revoking respondent’s driving privilege for a period of three years. We affirm.
Facts
Respondent Carlos Villa Zapata was arrested for driving under the influence of alcohol on January 19, 1990. He was charged by criminal complaint filed in the San Francisco Municipal Court with a violation of Vehicle Code section 23152, subdivision (a), 1 and it was also alleged that he refused to complete a chemical test pursuant to section 23159, subdivision (b). Respondent moved to suppress evidence pursuant to Penal Code section 1538.5. Evidence was taken and argument heard. In its written order entitled “Finding of Fact and Order Suppressing Evidence After Hearing on § 1538.5 PC Motion,” the municipal court concluded that the activity of the police “constituted an arrest of the Defendant without probable cause.” The municipal court ordered suppressed all observations made by the arresting police officers, any statements made by the respondent, and any evidence concerning respondent’s refusal to submit to chemical testing. At the hearing on the motion to suppress, the People were represented by a prosecuting attorney from the San Francisco District Attorney’s Office. No review of the order suppressing evidence was sought by the district attorney (see Pen. Code, § 1538.5, subd. (j)) and, respondent alleges, the criminal case was thereafter dismissed on May 9, 1990.
On May 11, 1990, two days following dismissal of the criminal action, an administrative hearing was held before a DMV referee to determine whether respondent’s driving privilege should be revoked for failure to submit to chemical testing. (See § 13353.) In order to support a revocation under section 13353, as expressly recognized by the referee, a finding must be made that respondent was “lawfully arrested.” (See
Music
v.
Department of Motor Vehicles
(1990)
On July 3, 1990, an order revoking respondent’s driving privilege was entered. With respect to the defense of collateral estoppel, the referee *112 concluded: “With regard to the illegal arrest, the referee notes that the hearing held before the judge was not an adjudication of the DUI charge, but rather a specialized hearing on a motion to suppress evidence. Although the judge’s ruling consequently affects the ability to try the DUI charge, it does not specifically adjudicate that charge. As the court has no privity with the Department of Motor Vehicles and vice versa, in regard to the adjudication of action taken pursuant to Section 13353 of the California Vehicle Code, this referee determines that the evidence presented at this hearing is sufficient to make findings on the four Implied Consent issues . . . .” The referee then found, on the issue of the lawfulness of respondent’s arrest, that “Carlos Villa Zapata was lawfully arrested.”
Respondent then sought writ relief in the superior court contending, as he did before the DMV referee, that collateral estoppel barred relitigation of the arrest issue. The superior court agreed and issued a writ vacating the revocation.
Discussion
Collateral estoppel precludes relitigation of issues argued and decided in prior proceedings.
(Teitelbaum Furs, Inc.
v.
Dominion Ins. Co., Ltd.
(1962)
Clearly, the issue of the lawfulness of respondent’s arrest is the “identical” issue previously decided by the municipal court. Since the decision of the municipal court that respondent’s arrest was unlawful followed a contested evidentiary hearing, the issue was unquestionably “actually litigated.” The issue was also “necessarily decided” because the unlawfulness of respondent’s arrest was the basis of the motion and the basis upon which the order suppressing evidence issued. The decision of the municipal court was “final” at the time of the DMV hearing because the prosecutor did not seek review *113 of the court’s order (see Pen. Code, § 1538.5, subd. (j)) and, in any event, the criminal case had been dismissed. The decision was also “on the merits” of the arrest issue, which is the issue that respondent contends cannot be relitigated by DMV.
Appellant’s principal challenge is to the last threshold requirement that “the party against whom preclusion is sought must be the same as, or in privity with, the party to the former proceeding.”
(Lucido
v.
Superior Court, supra,
Appellant urges us to reject
Shackelton
and
Buttimer,
two cases directly on point, in favor of
Lofthouse
v.
Department of Motor Vehicles
(1981)
In
Pawlowski
v.
Pierce, supra,
“Privity is essentially a shorthand statement that collateral estoppel is to be applied in a given case; there is no universally applicable definition of privity.”
(Lynch
v.
Glass
(1975)
It must be remembered that in
People
v.
Sims, supra,
*115
The obvious purpose of both agencies in both proceedings is to protect the public from those who drive under the influence of alcohol or drugs. From each proceeding, sanctions may flow that will hopefully deter such conduct. In the criminal proceeding, sanctions may include incarceration, fine, and other penalties including an order from the court that DMV suspend a defendant’s driving privilege. (See § 23160 et seq.) In the DMV administrative proceedings, sanctions include suspension or revocation of the defendant’s driving privilege. Neither agency may obtain these sanctions if the evidentiary basis is the product of an unlawful arrest. (See
Music
v.
Department of Motor Vehicles, supra,
Since both agencies represent the state, both have the same interest of protecting the public from those who drive under the influence, and both initiate proceedings in an effort to obtain sanctions to deter such conduct, it is clear that the relationship between the district attorney and DMV in the context of DUI enforcement is “sufficiently close” to support a finding of privity for the purpose of applying collateral estoppel. (See People v. Sims, supra, 32 Cal.3d at pp. 486-488.)
Having determined that the threshold requirements for application of collateral estoppel are present, we must next determine whether there are any public policy considerations that would preclude application herein. Those policy considerations include the preservation of the integrity of the judicial system, promotion of judicial economy, and protection of litigants from harassment by vexatious litigation. (See
Lucido
v.
Superior Court, supra,
Public confidence in the integrity of the judicial system is obviously threatened when a nonjudicial officer, in an informal administrative hearing with no testimony taken, is permitted to relitigate the validity of an arrest that has been previously determined by a municipal court judge, at a contested evidentiary hearing, in the formal setting of a criminal prosecution. If this scenario does not tend to undermine the “integrity of the judicial system,” it is difficult to conceive of what would. Sims found an impairment to the integrity of the judicial system when the administrative hearing preceded the criminal proceedings. When, as here, it is the prior judicial decision that is being ignored in the subsequent administrative hearing, the impact on the integrity of “judicial system” is even more direct and magnified. Finally, we discern nothing in Lucido that would dictate a different result. On the contrary, Lucido supports our analysis because application of collateral estoppel will not preclude the favored hearing on the merits. That *116 hearing took place in the municipal court on the motion to suppress evidence. It is the judicial determination on the merits of the arrest issue that precludes relitigation of the same issue in the subsequent administrative proceeding. 2
The remaining two policy considerations—promotion of judicial economy and protection of litigants from harassment of vexatious litigation—do not require extensive discussion. Judicial economy will be promoted by precluding a second litigation of the arrest issue when that issue has been previously resolved in the criminal case. The policy against vexatious litigation is also satisfied when the state first litigates the issue at a contested hearing in the criminal case, declines to seek further judicial review as provided by statute, and then attempts to litigate for a second time the same issue on the same facts in a different forum and at a hearing that lacks the formalities, protections, and judicial scrutiny that existed at the first hearing.
Conclusion
Having determined that the threshold requirements for application of collateral estoppel are present and that the relevant public policies favor application in this case, the superior court’s order precluding appellant from relitigating the validity of respondent’s arrest was correct and its order vacating the license revocation was proper.
Accordingly, the judgment is affirmed.
Anderson, P. J„ and Poché, J., concurred.
Notes
All subsequent section references are to the Vehicle Code unless otherwise indicated.
With respect to this particular policy consideration, it should be observed that had the DMV hearing been conducted before the suppression hearing in municipal court, an argument could be advanced under Lucido that collateral estoppel should not be applied to the subsequent judicial proceeding because to do so would preclude a full and fair hearing on the merits. In fact, as a result of legislation that became effective after the events here, a determination of issues by DMV “has no collateral estoppel effect on a subsequent criminal prosecution . . . .” (§ 13558, subd. (g).) That is not our case, however, and here the favored hearing is not precluded but rather serves to preclude.
