delivered the opinion of the Court.
We granted certiorari to decide whether a gun owner’s acquittal on criminal charges involving firearms precludes a subsequent in rem forfeiture proceeding against those same firearms.
I-H
<3
On January 20, 1977, the Bureau of Alcohol, Tobacco, and Firearms seized a cache of firearms from the home of Patrick Mulcahey. Mulcahey was subsequently indicted on charges that he had knowingly engaged in the business of dealing in firearms without a license, in violation of 18 U. S. C. *356 § 922(a)(1). 1 At his criminal trial, Mulcahey admitted that he had no license to deal in firearms and that he had bought and sold firearms during the period set forth in the indictment. His defense was that he had been entrapped into making the illegal firearms transactions. The jury returned a verdict of not guilty.
Following Mulcahey’s acquittal of the criminal charges, the United States, pursuant to its authority under 18 U. S. C. § 924(d),
2
instituted this
in rem
action for forfeiture of the seized firearms.
3
On the basis of his earlier acquittal, Mul-cahey asserted the defenses of res judicata and collateral es-toppel. The United States District Court for the District of South Carolina struck Mulcahey’s defenses, reasoning that an
in rem
forfeiture proceeding under 18 U. S. C. § 924(d) is remedial in nature and is therefore properly characterized as
*357
a civil proceeding.
B
A divided United States Court of Appeals for the Fourth Circuit, sitting en banc, reversed.
4
I
In Coffey v. United States, supra, this Court held that a forfeiture action brought against certain distilling equipment was barred by the owner’s prior acquittal on charges of removing and concealing distilled spirits with the intent to defraud the revenue. The Court stated:
*358 “[W]here an issue raised as to the existence of the act or fact denounced has been tried in a criminal proceeding, instituted by the United States, and a judgment of acquittal has been rendered in favor of a particular person, that judgment is conclusive in favor of such person, on the subsequent trial of a suit in rem by the United States, where, as against him, the existence of the same act or fact is the matter in issue, as a cause for the forfeiture of the property prosecuted in such suit in rem. It is urged as a reason for not allowing such effect to the judgment, that the acquittal in the criminal case may have taken place because of the rule requiring guilt to be proved beyond a reasonable doubt, and that, on the same evidence, on the question of preponderance of proof, there might be a verdict for the United States, in the suit in rem. Nevertheless, the fact or act has been put in issue and determined against the United States; and all that is imposed by the statute, as a consequence of guilt, is a punishment therefor. There could be no new trial of the criminal prosecution after the acquittal in it; and a subsequent trial of the civil suit amounts to substantially the same thing, with a difference only in the consequences following a judgment adverse to the claimant.” Id., at 443.
Although the language quoted above incorporates notions of both collateral estoppel and double jeopardy, the Coffey Court did not identify the precise legal foundation for the rule of preclusion it announced. Perhaps for this reason, later decisions of this Court have reflected uncertainty as to the exact scope of the Coffey holding.
In
Helvering
v.
Mitchell,
This Court, speaking through Justice Brandéis, disagreed. Although the taxpayer argued and the Government conceded that the factual matters at issue in the penalty proceeding had been litigated and determined in the prior criminal action, the Court concluded that “[t]he difference in degree of the burden of proof in criminal and civil cases precludes application of the doctrine of
res
judicata303 U. S., at 397. The
Mitchell
Court viewed the criminal acquittal as nothing more than a determination that the evidence in the criminal setting was not sufficient to overcome all reasonable doubt that the accused was guilty. See
Lewis
v.
Frick,
“That acquittal on a criminal charge is not a bar to a civil action by the Government, remedial in its nature, arising out of the same facts on which the criminal proceeding was based has long been settled. Stone v. United States,167 U. S. 178 , 188; Murphy v. United States,272 U. S. 630 , 631, 632. Compare Chantangco v. Abaroa,218 U. S. 476 , 481, 482.”303 U. S., at 397-398 (footnote omitted).
Turning to the taxpayer’s argument that double jeopardy barred the assessment of a monetary penalty following his acquittal on related criminal charges, the Court noted:
“Congress may impose both a criminal and a civil sanction in respect to the same act or omission; for the double jeopardy clause prohibits merely punishing twice, or attempting a second time to punish criminally, for the same offense. The question for decision is thus whether *360 [the monetary penalty] imposes a criminal sanction. That question is one of statutory interpretation.” Id., at 399.
In concluding that the monetary penalty was merely a remedial civil sanction authorized by Congress to be assessed at the discretion of those administering the tax law, the Court observed that forfeiture of goods or their value and the payment of fixed or variable sums of money are sanctions that have long been recognized as enforceable by civil proceedings. Id., at 400.
Finally, the
Mitchell
Court considered the effect of the holding in
Coffey
upon the facts before it. The Court distinguished
Coffey
on the ground that the
Coffey
rule did not apply where an acquittal on a criminal charge was followed by a civil action requiring a different degree of proof. The
Mitchell
Court concluded that the monetary penalty imposed by the revenue laws was a civil administrative sanction; it therefore found
Coffey
no obstacle to the recovery of the penalty from the taxpayer.
Most recently, in
One Lot Emerald Cut Stones
v.
United States,
*361 In focusing on Coffey v. United States, the Court of Appeals appears to have overlooked the significance of Mitchell and One Lot Emerald Cut Stones. At the very least, Mitchell signaled that an acquittal of a criminal charge does not automatically bar an action to enforce sanctions by way of forfeiture of goods or other civil penalties. Whatever the validity of Coffey on its facts, its ambiguous reasoning seems to have been a source of confusion for some time. As long ago as Mitchell, this Court was urged to disapprove Coffey so as to make clear that an acquittal in a criminal trial does not bar a civil action for forfeiture even though based on the identical facts. Indeed, for nearly a century, the analytical underpinnings of Coffey have been recognized as less than adequate. 5 The time has come to clarify that neither collateral estoppel nor double jeopardy bars a civil, remedial forfeiture proceeding initiated following an acquittal on related criminal charges. To the extent that Coffey v. United States suggests otherwise, it is hereby disapproved.
r — H HH I — I
A
The disposition of the instant case follows readily from the principles articulated in
Mitchell
and
One Lot Emerald Cut Stones.
Mulcahey first argues that, because of his earlier criminal acquittal, the doctrine of collateral estoppel operates to preclude the § 924(d) forfeiture action. But an acquittal on criminal charges does not prove that the defendant is innocent; it merely proves the existence of a reasonable doubt as to his guilt. We need not be concerned whether the jury decided to acquit Mulcahey because he was entrapped into making an illegal sale or whether the jurors were not convinced of
*362
his guilt beyond a reasonable doubt for other reasons. In either case, the jury verdict in the criminal action did not negate the possibility that a preponderance of the evidence could show that Mulcahey was engaged in an unlicensed firearms business. Mulcahey’s acquittal on charges brought under § 922(a)(1) therefore does not estop the Government from proving in a civil proceeding that the firearms should be forfeited pursuant to § 924(d). It is clear that the difference in the relative burdens of proof in the criminal and civil actions precludes the application of the doctrine of collateral es-toppel.
Helvering
v.
Mitchell,
B
Mulcahey next contends that a forfeiture proceeding under § 924(d) is barred by the Double Jeopardy Clause of the Fifth Amendment. Unless the forfeiture sanction was intended as punishment, so that the proceeding is essentially criminal in character, the Double Jeopardy Clause is not applicable.
Helvering
v.
Mitchell,
“Our inquiry in this regard has traditionally proceeded on two levels. First, we have set out to determine whether Congress, in establishing the penalizing mechanism, indicated either expressly or impliedly a preference for one label or the other. See One Lot Emerald Cut Stones v. United States, supra, at 236-237. Second, where Congress has indicated an intention to establish a civil penalty, we have inquired further whether the statutory scheme was so punitive either in purpose or *363 effect as to negate that intention. See Flemming v. Nestor,363 U. S. 603 , 617-621 (1960).”
Applying the first prong of the Ward test to the facts of the instant case, we conclude that Congress designed forfeiture under § 924(d) as a remedial civil sanction. Congress’ intent in this regard is most clearly demonstrated by the procedural mechanisms it established for enforcing forfeitures under the statute. Section 924(d) does not prescribe the steps to be followed in effectuating a forfeiture, but rather incorporates by reference the procedures of the Internal Revenue Code of 1954 (Code), 26 U. S. C. §§7321-7328. The Code in turn provides that an action to enforce a forfeiture “shall be in the nature of a proceeding in rem in the United States District Court for the district where such seizure is made.” 26 U. S. C. § 7323. In contrast to the
in personam
nature of criminal actions, actions
in rem
have traditionally been viewed as civil proceedings, with jurisdiction dependent upon seizure of a physical object. See
Calero-Toledo
v.
Pearson Yacht Leasing Co.,
Moreover, § 924(d) is somewhat broader in scope than the criminal provisions of 18 U. S. C. § 922. Section 924(d) subjects to forfeiture “[a]ny firearm or ammunition involved in or used or intended to be used in, any violation of the provisions of this chapter.” (Emphasis added.) But § 922(a)(1), the substantive criminal provision under which Mulcahey was prosecuted, does not render unlawful an intention to engage in the business of dealing in firearms without a license; only the completed act of engaging in the prohibited business is *364 made a crime. See n. 1, supra. Whatever the actual scope of the conduct embraced by § 924(d), it is apparent from the differences in the language of these two statutes that the forfeiture provisions of § 924(d) were meant to be broader in scope than the criminal sanctions of § 922(a)(1).
Finally, the forfeiture provision of § 924(d) furthers broad remedial aims. Section 924(d) was enacted as part of the Omnibus Crime Control and Safe Streets Act of 1968, Pub. L. 90-351, 82 Stat. 233, and later retained without alteration in the Gun Control Act of 1968, Pub. L. 90-618, 82 Stat. 1224. In enacting the 1968 gun control legislation, Congress “was concerned with the widespread traffic in firearms and with their general availability to those whose possession thereof was contrary to the public interest.”
Huddleston
v.
United States,
*365
We now turn to the second aspect of our inquiry: “whether the statutory scheme [is] so punitive either in purpose or effect as to negate” Congress’ intention to establish a civil remedial mechanism.
United States
v.
Ward,
Only one of the
Mendoza-Martinez
factors — whether or not the proscribed behavior is already a crime — lends any support to Mulcahey’s position that § 924(d) imposes a criminal penalty. The fact that actions giving rise to forfeiture proceedings under § 924(d) may also entail the criminal penalties of § 922(a)(1) admittedly suggests that § 924(d) is criminal in nature. But that indication is not as strong as it might seem at first blush.
United States
v.
Ward, supra,
at 250. Clearly “Congress may impose both a criminal and a civil sanction in respect to the same act or omission,”
Helvering
v.
Mitchell,
In short, an analysis of the
Mendoza-Martinez
factors in no way undermines Congress’ classification of the § 924(d) forfeiture action as a civil sanction. Mulcahey has failed to establish by the “clearest proof” that Congress has provided a sanction so punitive as to “transfor[m] what was clearly intended as a civil remedy into a criminal penalty.”
Rex Trailer Co.
v.
United States,
> I — I
We hold that a gun owner’s acquittal on criminal charges involving firearms does not preclude a subsequent
in rem
forfeiture proceeding against those firearms under § 924(d). Neither collateral estoppel nor the Double Jeopardy Clause affords a doctrinal basis for such a rule of preclusion, and we reject today the contrary rationale of
Coffey
v.
United States,
It is so ordered.
Notes
Title 18 U. S. C. §922(a)(1) provides:
“It shall be unlawful ... for any person, except a licensed importer, licensed manufacturer, or licensed dealer, to engage in the business of importing, manufacturing, or dealing in firearms or ammunition, or in the course of such business to ship, transport, or receive any firearm or ammunition in interstate or foreign commerce.”
Title 18 U. S. C. § 924(d) provides:
“Any firearm or ammunition involved in or used or intended to be used in, any violation of the provisions of this chapter or any rule or regulation promulgated thereunder, or any violation of any other criminal law of the United States, shall be subject to seizure and forfeiture and all provisions of the Internal Revenue Code of 1954 relating to the seizure, forfeiture, and disposition of firearms, as defined in section 5845(a) of that Code, shall, so far as applicable, extend to seizures and forfeitures under the provisions of this chapter.”
The number of firearms involved in this action has varied somewhat with time. Federal agents originally seized 105 firearms from Mulcahey, but later learned that 13 of them had been stolen. The stolen items were returned to their rightful owners, and the forfeiture action proceeded against the remaining 92 items. Later an additional automatic pistol was found, bringing the total to 93. Still later, for reasons not relevant here, 4 of the seized firearms were returned to Mulcahey’s wife, leaving 89 firearms as the subject of the forfeiture proceeding.
A divided panel of the Fourth Circuit had previously reversed the District Court’s forfeiture order.
See,
e. g., United States
v.
Burch,
Mulcahey relies heavily upon Congress’ labeling of §924 with the appellation “Penalties,” arguing that inclusion of the forfeiture provision in that section demonstrates Congress’ intention to create an additional criminal sanction. This argument is unavailing; both criminal and civil sanctions may be labeled “penalties.” Moreover, the congressional Reports accompanying § 924 describe it as “containing] the penalty and forfeiture provisions,” H. R. Rep. No. 1577, 90th Cong., 2d Sess., 17 (1968); S. Rep. No. 1097, 90th Cong., 2d Sess., 117 (1968), indicating that Congress was cognizant of the important differences between criminal punishment and in rem forfeiture.
In
Kennedy
v.
Mendoza-Martinez,
the Court enumerated “the tests traditionally applied to determine whether an Act of Congress is penal or regulatory in character.”
“Whether the sanction involves an affirmative disability or restraint, whether it has historically been regarded as a punishment, whether it comes into play only on a finding of scienter, whether its operation will promote the traditional aims of punishment — retribution and deterrence, whether the behavior to which it applies is already a crime, whether an alternative purpose to which it may rationally be connected is assignable for it, and whether it appears excessive in relation to the alternative purpose assigned are all relevant to the inquiry, and may often point in differing directions.” Id., at 168-169 (footnotes omitted).
This list of considerations is, however, “neither exhaustive nor dispos-itive.”
United States
v.
Ward,
