[114]*114Justice Stevens
announced the judgment of the Court and delivered an opinion, in which Justice Blackmun, Justice O’Connor, and Justice Souter join.
The question presented is whether an owner’s lack of knowledge of the fact that her home had been purchased with the proceeds of illegal drug transactions constitutes a defense to a forfeiture proceeding under the Comprehensive Drug Abuse Prevention and Control Act of 1970, § 511(a), 84 Stat. 1276, as amended, 21 U. S. C. § 881(a)(6).1
I
On April 3, 1989, the Government filed an in rem action against the parcel of land in Rumson, New Jersey, on which respondent’s home is located. The verified complaint alleged that the property had been purchased in 1982 by respondent with funds provided by Joseph Brenna that were “the proceeds traceable to an [unlawful] exchange for a controlled substance,” App. 13, and that the property was therefore subject to seizure and forfeiture under § 881(a)(6), id., at 15.2
[115]*115On April 12, 1989, in an ex 'parte proceeding, the District Court determined that there was probable cause to believe the premises were subject to forfeiture, and issued a summons and warrant for arrest authorizing the United States marshal to take possession of the premises. Respondent thereafter asserted a claim to the property, was granted the right to defend the action,3 and filed a motion for summary judgment.
During pretrial proceedings, the following facts were established. In 1982, Joseph Brenna gave respondent approximately $240,000 to purchase the home that she and her three children have occupied ever since. Respondent is the sole owner of the property. From 1981 until their separation in 1987, she maintained an intimate personal relationship with Brenna. There is probable cause to believe that the funds used to buy the house were proceeds of illegal drug trafficking, but respondent swears that she had no knowledge of its origins.
[116]*116Among the grounds advanced in support of her motion for summary judgment was the claim that she was an innocent owner under § 881(a)(6). The District Court rejected this defense for two reasons: First, it ruled that “the innocent owner defense may only be invoked by those who can demonstrate that they are bona fide purchasers for value” (emphasis in original);4 second, the court read the statute to offer the innocent owner defense only to persons who acquired an interest in the property before the acts giving rise to the forfeiture took place.5
Respondent was allowed to take an interlocutory appeal pursuant to 28 U. S. C. § 1292(b). One of the controlling questions of law presented to the Court of Appeals was:
“Whether an innocent owner defense may be asserted by a person who is not a bona fide purchaser for value concerning a parcel of land where the government has established probable cause to believe that the parcel of land was purchased with monies traceable to drug proceeds.” 742 F. Supp. 189, 192 (NJ 1990).
Answering that question in the affirmative, the Court of Appeals remanded the case to the District Court to determine whether respondent was, in fact, an innocent owner. [117]*117The Court of Appeals refused to limit the innocent owner defense to bona fide purchasers for value because the plain language of the statute contains no such limitation,6 because it read the legislative history as indicating that the term “owner” should be broadly construed,7 and because the difference between the text of § 881(a)(6) and the text of the criminal forfeiture statute evidenced congressional intent not to restrict the civil section in the same way.8
The Court of Appeals also rejected the argument that respondent could not be an innocent owner unless she acquired the property before the drug transaction occurred. In advancing that argument the Government had relied on the “relation back” doctrine embodied in § 881(h), which provides that “[a]ll right, title, and interest in property described in subsection (a) of this section shall vest in the United States upon commission of the act giving rise to forfeiture under this section.” The court held that the relation back doctrine applied only to “property described in subsection (a)” and that the property at issue would not fit that description if respondent could establish her innocent owner defense. The court concluded that the Government’s interpretation of § 881(h) “would essentially serve to emasculate the innocent owner defense provided for in section 881(a)(6). No one ob-[118]*118taming property after the occurrence of the drug transaction — including a bona fide purchase for value — would be eligible to offer an innocent owner defense on his behalf.” 937 F. 2d 98, 102 (CA3 1991).
The conflict between the decision of the Court of Appeals and decisions of the Fourth and Tenth Circuits, see In re One 1985 Nissan, 889 F. 2d 1317 (CA4 1989); Eggleston v. Colorado, 873 F. 2d 242, 245-248 (CA10 1989), led us to grant certiorari, 503 U. S. 905 (1992). We now affirm.
II
Laws providing for the official seizure and forfeiture of tangible property used in criminal activity have played an important role in the history of our country. Colonial courts regularly exercised jurisdiction to enforce English and local statutes authorizing the seizure of ships and goods used in violation of customs and revenue laws.9 Indeed, the misuse [119]*119of the hated general warrant is often cited as an important cause of the American Revolution.10
The First Congress enacted legislation authorizing the seizure and forfeiture of ships and cargos involved in customs offenses.11 Other statutes authorized the seizure of ships engaged in piracy.12 When a ship was engaged in acts of “piratical aggression,” it was subject to confiscation notwithstanding the innocence of the owner of the vessel.13 [120]*120Later statutes involved the seizure and forfeiture of distilleries and other property used to defraud the United States of tax revenues from the sale of alcoholic beverages. See, e. g., United States v. Stowell, 133 U. S. 1, 11-12 (1890). In these cases, as in the piracy cases, the innocence of the owner of premises leased to a distiller would not defeat a decree of condemnation based on the fraudulent conduct of the lessee.14
[121]*121In all of these early cases the Government’s right to take possession of property stemmed from the misuse of the property itself. Indeed, until our decision in Warden, Md. Penitentiary v. Hayden, 387 U. S. 294
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[114]*114Justice Stevens
announced the judgment of the Court and delivered an opinion, in which Justice Blackmun, Justice O’Connor, and Justice Souter join.
The question presented is whether an owner’s lack of knowledge of the fact that her home had been purchased with the proceeds of illegal drug transactions constitutes a defense to a forfeiture proceeding under the Comprehensive Drug Abuse Prevention and Control Act of 1970, § 511(a), 84 Stat. 1276, as amended, 21 U. S. C. § 881(a)(6).1
I
On April 3, 1989, the Government filed an in rem action against the parcel of land in Rumson, New Jersey, on which respondent’s home is located. The verified complaint alleged that the property had been purchased in 1982 by respondent with funds provided by Joseph Brenna that were “the proceeds traceable to an [unlawful] exchange for a controlled substance,” App. 13, and that the property was therefore subject to seizure and forfeiture under § 881(a)(6), id., at 15.2
[115]*115On April 12, 1989, in an ex 'parte proceeding, the District Court determined that there was probable cause to believe the premises were subject to forfeiture, and issued a summons and warrant for arrest authorizing the United States marshal to take possession of the premises. Respondent thereafter asserted a claim to the property, was granted the right to defend the action,3 and filed a motion for summary judgment.
During pretrial proceedings, the following facts were established. In 1982, Joseph Brenna gave respondent approximately $240,000 to purchase the home that she and her three children have occupied ever since. Respondent is the sole owner of the property. From 1981 until their separation in 1987, she maintained an intimate personal relationship with Brenna. There is probable cause to believe that the funds used to buy the house were proceeds of illegal drug trafficking, but respondent swears that she had no knowledge of its origins.
[116]*116Among the grounds advanced in support of her motion for summary judgment was the claim that she was an innocent owner under § 881(a)(6). The District Court rejected this defense for two reasons: First, it ruled that “the innocent owner defense may only be invoked by those who can demonstrate that they are bona fide purchasers for value” (emphasis in original);4 second, the court read the statute to offer the innocent owner defense only to persons who acquired an interest in the property before the acts giving rise to the forfeiture took place.5
Respondent was allowed to take an interlocutory appeal pursuant to 28 U. S. C. § 1292(b). One of the controlling questions of law presented to the Court of Appeals was:
“Whether an innocent owner defense may be asserted by a person who is not a bona fide purchaser for value concerning a parcel of land where the government has established probable cause to believe that the parcel of land was purchased with monies traceable to drug proceeds.” 742 F. Supp. 189, 192 (NJ 1990).
Answering that question in the affirmative, the Court of Appeals remanded the case to the District Court to determine whether respondent was, in fact, an innocent owner. [117]*117The Court of Appeals refused to limit the innocent owner defense to bona fide purchasers for value because the plain language of the statute contains no such limitation,6 because it read the legislative history as indicating that the term “owner” should be broadly construed,7 and because the difference between the text of § 881(a)(6) and the text of the criminal forfeiture statute evidenced congressional intent not to restrict the civil section in the same way.8
The Court of Appeals also rejected the argument that respondent could not be an innocent owner unless she acquired the property before the drug transaction occurred. In advancing that argument the Government had relied on the “relation back” doctrine embodied in § 881(h), which provides that “[a]ll right, title, and interest in property described in subsection (a) of this section shall vest in the United States upon commission of the act giving rise to forfeiture under this section.” The court held that the relation back doctrine applied only to “property described in subsection (a)” and that the property at issue would not fit that description if respondent could establish her innocent owner defense. The court concluded that the Government’s interpretation of § 881(h) “would essentially serve to emasculate the innocent owner defense provided for in section 881(a)(6). No one ob-[118]*118taming property after the occurrence of the drug transaction — including a bona fide purchase for value — would be eligible to offer an innocent owner defense on his behalf.” 937 F. 2d 98, 102 (CA3 1991).
The conflict between the decision of the Court of Appeals and decisions of the Fourth and Tenth Circuits, see In re One 1985 Nissan, 889 F. 2d 1317 (CA4 1989); Eggleston v. Colorado, 873 F. 2d 242, 245-248 (CA10 1989), led us to grant certiorari, 503 U. S. 905 (1992). We now affirm.
II
Laws providing for the official seizure and forfeiture of tangible property used in criminal activity have played an important role in the history of our country. Colonial courts regularly exercised jurisdiction to enforce English and local statutes authorizing the seizure of ships and goods used in violation of customs and revenue laws.9 Indeed, the misuse [119]*119of the hated general warrant is often cited as an important cause of the American Revolution.10
The First Congress enacted legislation authorizing the seizure and forfeiture of ships and cargos involved in customs offenses.11 Other statutes authorized the seizure of ships engaged in piracy.12 When a ship was engaged in acts of “piratical aggression,” it was subject to confiscation notwithstanding the innocence of the owner of the vessel.13 [120]*120Later statutes involved the seizure and forfeiture of distilleries and other property used to defraud the United States of tax revenues from the sale of alcoholic beverages. See, e. g., United States v. Stowell, 133 U. S. 1, 11-12 (1890). In these cases, as in the piracy cases, the innocence of the owner of premises leased to a distiller would not defeat a decree of condemnation based on the fraudulent conduct of the lessee.14
[121]*121In all of these early cases the Government’s right to take possession of property stemmed from the misuse of the property itself. Indeed, until our decision in Warden, Md. Penitentiary v. Hayden, 387 U. S. 294 (1967), the Government had power to seize only property that “ ‘the private citizen was not permitted to possess.’ ”15 The holding in that case that the Fourth Amendment did not prohibit the seizure of “mere evidence” marked an important expansion of governmental power. See Zurcher v. Stanford Daily, 436 U. S. 547, 577-580 (1978) (Stevens, J., dissenting).
The decision by Congress in 1978 to amend the Comprehensive Drug Abuse Prevention and Control Act of 1970, 84 Stat. 1236, to authorize the seizure and forfeiture of proceeds of illegal drug transactions, see 92 Stat. 3777, also marked an important expansion of governmental power.16 Before that amendment, the statute had authorized forfeiture of only the [122]*122illegal substances themselves and the instruments by which they were manufactured and distributed.17 The original forfeiture provisions of the 1970 statute had closely paralleled the early statutes used to enforce the customs laws, the piracy laws, and the revenue laws: They generally authorized the forfeiture of property used in the commission of criminal activity, and they contained no innocent owner defense. They applied to stolen goods, but they did not apply to proceeds from the sale of stolen goods. Because the statute, after its 1978 amendment, does authorize the forfeiture of such proceeds and also contains an express and novel protec[123]*123tion for innocent owners, we approach the task of construing it with caution.
III
The Court of Appeals correctly concluded that the protection afforded to innocent owners is not limited to bona fide purchasers. The text of the statute is the strongest support for this conclusion. The statute authorizes the forfeiture of moneys exchanged for a controlled substance, and “all proceeds traceable to such an exchange,” with one unequivocal exception:
“[N]o property shall be forfeited under this paragraph, to the extent of the interest of an owner, by reason of any act or omission established by that owner to have been committed or omitted without the knowledge or consent of that owner.” 21 U. S. C. § 881(a)(6).
The term “owner” is used three times and each time it is unqualified. Such language is sufficiently unambiguous to foreclose any contention that it applies only to bona fide purchasers. Presumably that explains why the Government does not now challenge this aspect of the Court of Appeals’ ruling.
That the funds respondent used to purchase her home were a gift does not, therefore, disqualify respondent from claiming that she is an owner who had no knowledge of the alleged fact that those funds were “proceeds traceable” to illegal sales of controlled substances. Under the terms of the statute, her status would be precisely the same if, instead of having received a gift of $240,000 from Brenna, she had sold him a house for that price and used the proceeds to buy the property at issue.
IV
Although the Government does not challenge our interpretation of the statutory term “owner,” it insists that respondent is not the “owner” of a house she bought in 1982 and has lived in ever since. Indeed, it contends that she never has [124]*124been the owner of this parcel of land because the statute vested ownership in the United States at the moment when the proceeds of an illegal drug transaction were used to pay the purchase price. In support of its position, the Government relies on both the text of the 1984 amendment to the statute and the common-law relation back doctrine. We conclude, however, that neither the amendment nor the common-law rule makes the Government an owner of property before forfeiture has been decreed.
In analyzing the Government’s relation back argument, it is important to remember that respondent invokes the innocent owner defense against a claim that proceeds traceable to an illegal transaction are forfeitable. The Government contends that the money that Brenna received in exchange for narcotics became Government property at the moment Brenna received it and that respondent’s house became Government property when that tainted money was used in its purchase. Because neither the money nor the house could have constituted forfeitable proceeds until after an illegal transaction occurred, the Government’s submission would effectively eliminate the innocent owner defense in almost every imaginable case in which proceeds could be forfeited. It seems unlikely that Congress would create a meaningless defense. Moreover, considering that a logical application of the Government’s submission would result in the forfeiture of property innocently acquired by persons who had been paid with illegal proceeds for providing goods or services to drug traffickers,18 the burden of persuading us that Congress intended such an inequitable result is especially heavy.
[125]*125The Government recognizes that the 1984 amendment did not go into effect until two years after respondent acquired the property at issue in this case. It therefore relies heavily on the common-law relation back doctrine applied to in rem forfeitures. That doctrine applied the fiction that property used in violation of law was itself the wrongdoer that must be held to account for the harms it had caused.19 Because the property, or “res,” was treated as the wrongdoer, it was appropriate to regard it as the actual party to the in rem forfeiture proceeding. Under the relation back doctrine, a decree of forfeiture had the effect of vesting title to the offending res in the Government as of the date of its offending conduct. Because we are not aware of any common-law precedent for treating proceeds traceable to an unlawful exchange as a fictional wrongdoer subject to forfeiture, it is not entirely clear that the common-law relation back doctrine is applicable. Assuming that the doctrine does apply, however, it is nevertheless clear that under the common-law rule the fictional and retroactive vesting was not self-executing.
Chief Justice Marshall explained that forfeiture does not automatically vest title to property in the Government:
“It has been proved, that in all forfeitures accruing at common law, nothing vests in the government until some legal step shall be taken for the assertion of its right, after which, for many purposes, the doctrine of relation carries back the title to the commission of the offence.” United States v. Grundy, 3 Cranch 337, 350-351 (1806).20
[126]*126The same rule applied when a statute (a statute that contained no specific relation back provision) authorized the forfeiture. In a passage to which the Government has referred us,21 we stated our understanding of how the Government’s title to forfeited property relates back to the moment of forfeitability:
“By the settled doctrine of this court, whenever a statute enacts that upon the commission of a certain act specific property used in or connected with that act shall be forfeited, the forfeiture takes effect immediately upon the commission of the act; the right to the property then vests in the United States, although their title is not perfected until judicial condemnation; the forfeiture constitutes a statutory transfer of the right to the United States at the time the offence is committed; and [127]*127the condemnation, when obtained, relates back to that time, and avoids all intermediate sales and alienations, even to purchasers in good faith.” United States v. Stowell, 133 U. S., at 16-17 (emphases added).
If the Government wins a judgment of forfeiture under the common-law rule — which applied to common-law forfeitures and to forfeitures under statutes without specific relation back provisions — the vesting of its title in the property relates back to the moment when the property became forfeit-able. Until the Government does win such a judgment, however, someone else owns the property. That person may therefore invoke any defense available to the owner of the property before the forfeiture is decreed.
In this case a statute allows respondent to prove that she is an innocent owner. And, as the Chief Justice further explained in Grundy, if a forfeiture is authorized by statute, “the rules of the common law may be dispensed with,” 3 Cranch, at 351. Congress had the opportunity to dispense with the common-law doctrine when it enacted § 881(h); as we read that subsection, however, Congress merely codified the common-law rule. Because that rule was never applied to the forfeiture of proceeds, and because the statute now contains an innocent owner defense, it may not be immediately clear that they lead to the same result.
The 1984 amendment provides:
“All right, title, and interest in property described in subsection (a) of this section shall vest in the United States upon commission of the act giving rise to forfeiture under this section.” 21 U. S. C. § 881(h).
Because proceeds traceable to illegal drug transactions are a species of “property described in subsection (a),” the Government argues that this provision has the effect of preventing such proceeds from becoming the property of anyone other than the United States. The argument fails.
[128]*128Although proceeds subject to § 881(h) are “described” in the first part of subsection (a)(6), the last clause of that subsection exempts certain proceeds — proceeds owned by one unaware of their criminal source — from forfeiture. As the Senate Report on the 1984 amendment correctly observed, the amendment applies only to “property which is subject to civil forfeiture under section 881(a).”22 Under § 881(a)(6), the property of one who can satisfy the innocent owner defense is not subject to civil forfeiture. Because the success of any defense available under § 881(a) will necessarily determine whether § 881(h) applies, § 881(a)(6) must allow an assertion of the defense before § 881(h) applies.23
[129]*129Therefore, when Congress enacted this innocent owner defense, and then specifically inserted this relation back provision into the statute, it did not disturb the common-law rights of either owners of forfeitable property or the Government. The common-law rule had always allowed owners to invoke defenses made available to them before the Government’s title vested, and after title did vest, the common-law rule had always related that title back to the date of the commission of the act that made the specific property forfeit-able. Our decision denies the Government no benefits of the relation back doctrine. The Government cannot profit from the common-law doctrine of relation back until it has obtained a judgment of forfeiture. And it cannot profit from the statutory version of that doctrine in § 881(h) until respondent has had the chance to invoke and offer evidence to support the innocent owner defense under § 881(a)(6).
V
As a postscript we identify two issues that the parties have addressed, but that need not be decided.
The Government has argued that the Court of Appeals’ construction of the statute is highly implausible because it would enable a transferee of the proceeds of an illegal exchange to qualify as an innocent owner if she was unaware of the illegal transaction when it occurred but learned about it before she accepted the forfeitable proceeds. Respondent disputes this reading of the statute and argues that both legislative history and common sense suggest that the transferee’s lack of knowledge must be established as of the time the proceeds at issue are transferred.24 Moreover, whether [130]*130or not the text of the statute is sufficiently ambiguous to justify resort to the legislative history, equitable doctrines may foreclose the assertion of an innocent owner defense by a party with guilty knowledge of the tainted character of the property. In all events, we need not resolve this issue in this case; respondent has assumed the burden of convincing the trier of fact that she had no knowledge of the alleged source of Brenna’s gift in 1982, when she received it.25 In its order denying respondent’s motion for summary judgment, the District Court assumed that respondent could prove what she had alleged, as did the Court of Appeals in allowing the interlocutory appeal from that order. We merely decide, as did both of those courts, whether her asserted defense was insufficient as a matter of law.26
At oral argument, the Government also suggested that the statutory reference to “all proceeds traceable to such an exchange” is subject to a narrowing construction that might avoid some of the harsh consequences suggested in the various amici briefs expressing concerns about the impact of the statute on real estate titles. See Tr. of Oral Arg. 5-10, 19-25. If a house were received in exchange for a quantity of illegal substances and that house were in turn exchanged for another house, would the traceable proceeds consist of the first house, the second house, or both, with the Government having an election between the two? Questions of this char[131]*131acter are not embraced within the issues that we granted certiorari to resolve, however, and for that reason, see Yee v. Escondido, 503 U. S. 519, 535-538 (1992), we express no opinion concerning the proper construction of that statutory term.
The judgment of the Court of Appeals is affirmed.
It is so ordered.