COFFIN, Chief Judge.
We granted rehearing en banc from a decision of a panel of this court1 reversing a district court’s order suppressing evidence against the appellee, George Pappas. Pap-pas was charged with acquiring and possessing a firearm in violation of 18 U.S.C. §§ 922(a)(6) and 922(h)(1). The firearm giving rise to this charge was discovered in the trunk of Pappas’s car during an inventory search that followed the warrantless seizure of the car by agents of the Drug Enforcement Administration (DEA) pursuant to a forfeiture statute, 21 U.S.C. § 881. Prior to trial, Pappas successfully pursued in the district court a motion to suppress the firearm, and the government appealed. Pappas raises three arguments before this court in favor of suppression: that the statute does not authorize such a warrantless seizure absent probable cause to believe that the vehicle was contemporaneously being used to violate the narcotics laws and some degree of exigency in the circumstances surrounding the seizure; that the warrantless seizure, even if authorized by the statute, was unconstitutional; and that the warrantless search following the seizure was unconstitutional, and its fruits, therefore, must be suppressed.
Legality of the Seizure Under the Statute
Section 881 provides, inter alia, for forfeiture to the government of vehicles used or intended to be used to transport or to facilitate the distribution of controlled substances in violation of the Comprehensive Drug Abuse Prevention and Control Act of 1970.2 Section 881(b) authorizes the seizure of property subject to forfeiture under the Act “upon process issued pursuant to the Supplemental Rules for Certain Admiralty and Maritime Claims”. Rule C of these rules, which sets forth the procedures for in rem proceedings, provides that in statutory forfeiture actions a verified complaint shall be filed containing “such allegations as may be required by the statute pursuant to which the action is brought”, Rule C(2), and “[ujpon the filing of the complaint the clerk shall forthwith issue a warrant for the arrest of the vessel or other property that is the subject of the action”, Rule C(3).
Section 881(b) also enumerates four exceptions to its warrant requirement.3 It is the fourth exception, subsection 881(b)(4), which authorizes warrantless seizures when “the Attorney General has probable cause to believe that the property has been used or is intended to be used in violation of this [title]”, that the government relies on as justifying its seizure of Pappas’s car. The government’s argument is, concisely, that in August of 1976 Pappas’s car was observed being used in connection with sales of two [327]*327quantities of cocaine and that based on this probable cause, agents of the DEA seized the car eleven months later pursuant to subsection 881(b)(4). Pappas does not dispute that the government had probable cause to believe that the car had been used to violate the narcotics laws eleven months before its seizure. He does, however, argue that this warrantless seizure does not fall within the “probable cause” exception to section 881(b)’s process requirement.4
We find no holdings, by either appellate or district courts, that squarely address the proper scope of warrantless seizures permissible under subsection 881(b)(4). In most of the cases applying this exception, federal agents had probable cause to believe that the vehicle in question was being used to transport contraband at the time of the seizure. See United States v. One 1972 Chevrolet Nova, 560 F.2d 464, 469-70 (1st Cir. 1977) (dictum); United States v. Capra, 501 F.2d 267, 280 (2d Cir. 1974); United States v. Thrower, 442 F.Supp. 272, 278 (E.D.Pa.), aff’d, 568 F.2d 771 (3d Cir. 1977); United States v. One 1975 Lincoln Continental, 72 F.R.D. 535, 540 (S.D.N.Y.1976). See also United States v. Miller, 589 F.2d 1117, 1132 (1st Cir. 1978); United States v. Balsalmo, 468 F.Supp. 1363 (D.Me.1979). Pappas urges us to hold that such contemporaneous probable cause is a necessary prerequisite of a warrantless seizure under subsection 881(b)(4). In support of this assertion, Pappas cites Judge Lay’s dissenting opinion5 in O’Reilly v. United States, 486 F.2d 208, 214 (8th Cir.), cert. denied, 414 U.S. 1043, 94 S.Ct. 351, 38 L.Ed.2d 234 (1973). Judge Lay argued:
“The exceptions under subsection 4 dealing with ‘probable cause’ would be self-defeating if they meant that process to seize property is not required in every case where the property has been used in violation of the Act. If the process requirement has any meaning it must be that process is necessary unless there exists probable cause that Section 881(a) is being contemporaneously violated and the exigencies of the surrounding circumstances make the requirement of obtaining process to seize the vehicle unreasonable and unnecessary.” (Emphasis in original.)
In United States v. One 1972 Chevrolet Nova, supra, we echoed the concerns of Judge Lay in O’Reilly: “Since § 881(b)(4) creates an exception that threatens to swallow § 881(b)’s warrant requirement, we would be reluctant to give it an absolutely literal reading.” 560 F.2d at 469 (citing O’Reilly v. United States, supra). Although Pappas urges us not to abandon our “allegiance” to Judge Lay’s dissent, the government quite correctly points out that in One 1972 Chevrolet Nova we merely said that subsection 881(b)(4) authorizes warrantless seizures “at least” when both contemporaneous probable cause and exigency are present. Id. at 469-70. Since the facts in that case satisfied both of these requirements, our reservations over giving literal effect to the statutory language, although perhaps suggestive of our view of the section under other circumstances, were dictum. Thus, we now face for the first time the task of determining whether the statute authorizes a warrantless seizure when the events providing the probable cause are remote in time from the actual seizure of the property and no exigent circumstances necessitate prompt action.6
[328]*328Our starting point is, of course, the statutory language itself. Although the meaning of subsection 881(b)(4) appears to admit but a single reading when viewed in isolation, we are guided by the principle of statutory construction that discrete clauses or subsections of a statute should be construed to effectuate the manifest purpose of the statute or section to which they directly relate. See Richards v. United States, 369 U.S. 1, 11, 82 S.Ct. 585, 7 L.Ed.2d 492 (1962). In section 881(b) Congress provided a general requirement of process for seizures executed to enforce the forfeiture provision of section 881(a), and then enumerated four exceptions to this requirement. But, as we observed in One 1972 Chevrolet Nova, supra,
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COFFIN, Chief Judge.
We granted rehearing en banc from a decision of a panel of this court1 reversing a district court’s order suppressing evidence against the appellee, George Pappas. Pap-pas was charged with acquiring and possessing a firearm in violation of 18 U.S.C. §§ 922(a)(6) and 922(h)(1). The firearm giving rise to this charge was discovered in the trunk of Pappas’s car during an inventory search that followed the warrantless seizure of the car by agents of the Drug Enforcement Administration (DEA) pursuant to a forfeiture statute, 21 U.S.C. § 881. Prior to trial, Pappas successfully pursued in the district court a motion to suppress the firearm, and the government appealed. Pappas raises three arguments before this court in favor of suppression: that the statute does not authorize such a warrantless seizure absent probable cause to believe that the vehicle was contemporaneously being used to violate the narcotics laws and some degree of exigency in the circumstances surrounding the seizure; that the warrantless seizure, even if authorized by the statute, was unconstitutional; and that the warrantless search following the seizure was unconstitutional, and its fruits, therefore, must be suppressed.
Legality of the Seizure Under the Statute
Section 881 provides, inter alia, for forfeiture to the government of vehicles used or intended to be used to transport or to facilitate the distribution of controlled substances in violation of the Comprehensive Drug Abuse Prevention and Control Act of 1970.2 Section 881(b) authorizes the seizure of property subject to forfeiture under the Act “upon process issued pursuant to the Supplemental Rules for Certain Admiralty and Maritime Claims”. Rule C of these rules, which sets forth the procedures for in rem proceedings, provides that in statutory forfeiture actions a verified complaint shall be filed containing “such allegations as may be required by the statute pursuant to which the action is brought”, Rule C(2), and “[ujpon the filing of the complaint the clerk shall forthwith issue a warrant for the arrest of the vessel or other property that is the subject of the action”, Rule C(3).
Section 881(b) also enumerates four exceptions to its warrant requirement.3 It is the fourth exception, subsection 881(b)(4), which authorizes warrantless seizures when “the Attorney General has probable cause to believe that the property has been used or is intended to be used in violation of this [title]”, that the government relies on as justifying its seizure of Pappas’s car. The government’s argument is, concisely, that in August of 1976 Pappas’s car was observed being used in connection with sales of two [327]*327quantities of cocaine and that based on this probable cause, agents of the DEA seized the car eleven months later pursuant to subsection 881(b)(4). Pappas does not dispute that the government had probable cause to believe that the car had been used to violate the narcotics laws eleven months before its seizure. He does, however, argue that this warrantless seizure does not fall within the “probable cause” exception to section 881(b)’s process requirement.4
We find no holdings, by either appellate or district courts, that squarely address the proper scope of warrantless seizures permissible under subsection 881(b)(4). In most of the cases applying this exception, federal agents had probable cause to believe that the vehicle in question was being used to transport contraband at the time of the seizure. See United States v. One 1972 Chevrolet Nova, 560 F.2d 464, 469-70 (1st Cir. 1977) (dictum); United States v. Capra, 501 F.2d 267, 280 (2d Cir. 1974); United States v. Thrower, 442 F.Supp. 272, 278 (E.D.Pa.), aff’d, 568 F.2d 771 (3d Cir. 1977); United States v. One 1975 Lincoln Continental, 72 F.R.D. 535, 540 (S.D.N.Y.1976). See also United States v. Miller, 589 F.2d 1117, 1132 (1st Cir. 1978); United States v. Balsalmo, 468 F.Supp. 1363 (D.Me.1979). Pappas urges us to hold that such contemporaneous probable cause is a necessary prerequisite of a warrantless seizure under subsection 881(b)(4). In support of this assertion, Pappas cites Judge Lay’s dissenting opinion5 in O’Reilly v. United States, 486 F.2d 208, 214 (8th Cir.), cert. denied, 414 U.S. 1043, 94 S.Ct. 351, 38 L.Ed.2d 234 (1973). Judge Lay argued:
“The exceptions under subsection 4 dealing with ‘probable cause’ would be self-defeating if they meant that process to seize property is not required in every case where the property has been used in violation of the Act. If the process requirement has any meaning it must be that process is necessary unless there exists probable cause that Section 881(a) is being contemporaneously violated and the exigencies of the surrounding circumstances make the requirement of obtaining process to seize the vehicle unreasonable and unnecessary.” (Emphasis in original.)
In United States v. One 1972 Chevrolet Nova, supra, we echoed the concerns of Judge Lay in O’Reilly: “Since § 881(b)(4) creates an exception that threatens to swallow § 881(b)’s warrant requirement, we would be reluctant to give it an absolutely literal reading.” 560 F.2d at 469 (citing O’Reilly v. United States, supra). Although Pappas urges us not to abandon our “allegiance” to Judge Lay’s dissent, the government quite correctly points out that in One 1972 Chevrolet Nova we merely said that subsection 881(b)(4) authorizes warrantless seizures “at least” when both contemporaneous probable cause and exigency are present. Id. at 469-70. Since the facts in that case satisfied both of these requirements, our reservations over giving literal effect to the statutory language, although perhaps suggestive of our view of the section under other circumstances, were dictum. Thus, we now face for the first time the task of determining whether the statute authorizes a warrantless seizure when the events providing the probable cause are remote in time from the actual seizure of the property and no exigent circumstances necessitate prompt action.6
[328]*328Our starting point is, of course, the statutory language itself. Although the meaning of subsection 881(b)(4) appears to admit but a single reading when viewed in isolation, we are guided by the principle of statutory construction that discrete clauses or subsections of a statute should be construed to effectuate the manifest purpose of the statute or section to which they directly relate. See Richards v. United States, 369 U.S. 1, 11, 82 S.Ct. 585, 7 L.Ed.2d 492 (1962). In section 881(b) Congress provided a general requirement of process for seizures executed to enforce the forfeiture provision of section 881(a), and then enumerated four exceptions to this requirement. But, as we observed in One 1972 Chevrolet Nova, supra, a literal reading of the (b)(4) “probable cause” exception would vitiate the section’s warrant requirement. We would hesitate to construe the general provision as authorizing issuance of a warrant on less than a showing of probable cause, since this would conflict with the Fourth Amendment’s proscription that “no Warrants shall issue, but upon probable cause.” Thus we are unable to conceive of a class of cases in which the process requirement would be satisfied, yet the (b)(4) exception, read literally, would not at the same time apply; i. e., every case requiring process would also qualify for the exception to the requirement.
Our brother, in his concurrence, chides us for making the “novel assumption” that the warrant prescribed by Supplemental Rule C may issue only upon probable cause. We agree that this is a troublesome provision to apply in this context, since the prevailing law in admiralty cases is that a warrant to initiate an action in rem by attachment need not be accompanied by probable cause. See 7A Moore’s Federal Practice ¶ C.12 at 681-82 (2d ed. 1948). We do not undertake to reexamine or change the law of seizure in the intended context of the Supplemental Rules, however, for this is not an admiralty case.7 Section 881 is a punitive, quasi-criminal statute, cf. One 1958 Plymouth Sedan v. Pennsylvania, 380 U.S. 693, 700, 85 S.Ct. 1246, 14 L.Ed.2d 170 (1965) (seizure of vehicle used to violate liquor laws), and we suspect that Congress gave little consideration to the Fourth Amendment implications of applying the Supplemental Rules in this context.8
The Supreme Court has sanctioned the issuance of administrative search warrants on less than probable cause, Marshall v. Barlow’s, Inc., 436 U.S. 307, 97 S.Ct. 776, 50 L.Ed.2d 739 (1978), but has never done so in the context of a criminal or quasi-criminal proceeding. We do not see how the incorporation of a procedure from a context in which warrants traditionally have issued without probable cause can immunize a warrant from the Fourth Amendment’s generally applicable probable cause requirement. Our brother cites Judge Wright’s [329]*329dictum in Founding Church of Scientology v. United States, 133 U.S.App.D.C. 229, 409 F.2d 1146, 1150 (D.C.Cir.), cert. denied, 396 U.S. 963, 90 S.Ct. 434, 24 L.Ed.2d 427 (1969), for the proposition that probable cause is not a prerequisite for issuance of a warrant in civil forfeiture proceedings. We do not find this case apposite to our brother’s argument, however. The issue in Scientology was the propriety of a warrantless seizure measured against the reasonableness clause of the Fourth Amendment, not the expend-ability of the probable cause requirement under the warrant clause. We will not infer congressional abandonment of the Fourth Amendment’s protection against general warrants in a context in which the Court has not yet done so.
Moreover, we cannot see the sense of the statute if the requisite “warrant” may be obtained on less than probable cause. In view of the exceptions to the general provision, the only case in which the government would be required to obtain process for a seizure is that in which it is acting on a hunch or surmise about the possible illicit use or hazardous nature of property making it subject to forfeiture. If, as our brother argues is the case in admiralty, a judicial officer is duty-bound to issue such a warrant upon application, we can discern no salutary effect of such a warrant requirement other than the dubious benefit of arming the seizing officer with an official paper to give added legitimacy to his seizure. Thus, we decline to adhere to the literal language of the (b)(4) exception, since to do so would render essentially meaningless the basic provision it purports to qualify. See Rosado v. Wyman, 397 U.S. 397, 415, 90 S.Ct. 1207, 25 L.Ed.2d 442 (1970); 2A C. D. Sands, Statutes and Statutory Construction 65-66 (4th ed. 1973).
We are also drawn toward a circumscribed reading of the (b)(4) exception by our desire to avoid the constitutional questions that a broad construction would raise. The canons of statutory construction demand not only that we avoid construing this statute to violate the Constitution, see The Charming Betsy, 6 U.S. (2 Cranch) 64, 118, 2 L.Ed. 208 (1804), but that we construe the statute to avoid a question of its constitutionality, where such a construction is “fairly possible”, NLRB v. The Catholic Bishop of Chicago, 440 U.S. 490, 500, 511, 99 S.Ct. 1313, 59 L.Ed.2d 533 (1979); International Association of Machinists v. Street, 367 U.S. 740, 81 S.Ct. 1784, 6 L.Ed.2d 1141 (1961). Were we to apply the statute in the manner urged by the government, we would be required to decide whether the Fourth Amendment permits the warrantless seizure of an automobile based only upon a federal agent’s probable cause to believe that the government has a superior possessory interest in the vehicle 9; and if it does not, to hold the statute unconstitutional.
We are aware that our task is one of construction, not amendment, of this provision. See NLRB v. The Catholic Bishop of Chicago, supra, 440 U.S. at 511, 99 S.Ct. 1313 (Brennan, J., dissenting). Thus, we are limited to a reading of the statute that is “fairly possible”, one that will advance rather than subvert the congressional intention behind the statute. Id. The companion provisions to the “probable cause” exception, subsections (b)(1)-(b)(3), suggest a principle by which we can limit the reach of subsection (b)(4) in a manner that effectuates the intent embodied in the statute as a whole. Since each of the other three exceptions in section 881(b) involves circumstances in which either the need for or the practicality of process is significantly diminished or eliminated, we think it reasonable to [330]*330read the “probable cause” exception as justifying the warrantless seizure of an automobile only when the seizure immediately follows the occurrence that gives the federal agents probable cause to believe that the automobile is subject to forfeiture under section 881(a) and the exigencies of the surrounding circumstances make the requirement of obtaining process unreasonable or unnecessary. The seizure of Pap-pas’s automobile eleven months after its use in violation of the narcotics laws failed to meet either of these requirements.
Suppression of the Firearm
A.
Pappas, relying on the dissent in O'Reilly v. United States, supra, argues that because the seizure of his car violated the process requirement of section 881(b), the rifle discovered during the subsequent inventory search must be suppressed. Although we have not assessed the constitutionality of the seizure of Pappas’s car, the exclusionary rule is also applicable to violations of statutory restrictions on searches, seizures, and arrests. See Miller v. United States, 357 U.S. 301, 313-14, 78 S.Ct. 1190, 2 L.Ed.2d 1332 (1958). The Supreme Court has held warrantless “inventory” searches of vehicles legally seized pursuant to forfeiture statutes to be reasonable under the Fourth Amendment. South Dakota v. Opperman, 428 U.S. 364, 96 S.Ct. 3092, 49 L.Ed.2d 1000 (1976); Cooper v. California, 386 U.S. 58, 86 S.Ct. 1348, 16 L.Ed.2d 357 (1967). Implicit in Opperman and Cooper and in the subsequent cases applying these decisions in the context of searches of impounded vehicles, see e.g., United States v. Johnson, 572 F.2d 227, 233 (9th Cir. 1978); United States v. McCormick, 502 F.2d 281, 284 (9th Cir. 1974), is the rationale that the lawfulness of a warrantless inventory search depends on the lawfulness of the seizure of the vehicle. Although we think that in most cases the relationship between the two occurrences justifies suppression of the fruits of a search following an illegal seizure, the circumstances of this case dictate a different result.
In Michigan v. DeFillippo, 443 U.S. 31, 99 S.Ct. 2627, 61 L.Ed.2d 343 (1979), the defendant was arrested for refusing to identify himself to a police officer, a misdemeanor under a City of Detroit ordinance. The arresting officer performed a search of the defendant’s person incident to this arrest and discovered a controlled substance, for which the defendant was subsequently prosecuted. In reversing a Michigan Court of Appeals’ decision suppressing the evidence obtained during the search, the Supreme Court assumed that the ordinance under which DeFillippo was initially arrested was unconstitutional, but refused to apply the exclusionary rule to the fruits of the search incident to the arrest. The Court reasoned that the search was independent of the constitutionally tainted ordinance and that the arresting officer, acting in good faith, had probable cause to believe that DeFillippo had violated Michigan law and, therefore, was subject to arrest. Id. at 39, 99 S.Ct. 2633.
We recognize that the seizure of Pappas’s car stands in a somewhat different relationship to the inventory search than the violation of the Stop and Identify ordinance bore to the search in DeFillippo and that the antecedent event in this case — the illegal seizure — was violative of a federal statute, not the Constitution. Nevertheless, we think that the rationale of that case applies here as well. A warrantless inventory search following seizure of a vehicle is reasonable because it is conducted for benign purposes — protection of the owner’s property and protection of law enforcement officials from liability for theft — not to uncover evidence of criminal activity. See South Dakota v. Opperman, supra, 428 U.S. at 378, 96 S.Ct. 3092. (Powell, J., concurring); Cady v. Dombrowski, 413 U.S. 433, 93 S.Ct. 2523, 37 L.Ed.2d 706 (1973); Note, Warrantless Searches and Seizures of Automobiles, 87 Harv.L.Rev. 835, 848-52 (1974). Once a vehicle has been seized, especially if there is probable cause to believe it is sub[331]*331ject to forfeiture,10 the justification for an inventory search exists even if the antecedent seizure is eventually found to be illegal. Thus, a true inventory search, one that is not a pretext for gathering evidence,11 is independent of the seizure that precedes it. We do not think that the search of Pappas’s car necessarily became unreasonable, and therefore unconstitutional, because the car was illegally seized. Since the DEA agents had probable cause to believe that the government had a right to possession of the ear,12 they were entitled to inventory its contents. See Cooper v. California, supra, 386 U.S. at 61-62, 86 S.Ct. 1348, 16 L.Ed.2d 357; United States v. McCambridge, 551 F.2d 865, 870 (1st Cir. 1977).
The exclusionary rule ordinarily applies to the fruits of an illegal search or seizure, even if it was conducted pursuant to a statutory authorization never before held invalid. See, e.g., Ybarra v. Illinois, 440 U.S. 970, 99 S.Ct. 1532, 59 L.Ed.2d 786 (1979); Torrez v. Puerto Rico, 442 U.S. 465, 99 S.Ct. 2425, 61 L.Ed.2d 1 (1979); Almeida-Sanchez v. United States, 413 U.S. 266, 93 S.Ct. 2535, 37 L.Ed.2d 596 (1973). The Court justified its apparently contrary holding in' DeFillippo in terms of the policy underlying the exclusionary rule:
“The purpose of the Exclusionary Rule is to deter unlawful, police action. No conceivable purpose of deterrence would be served by suppressing evidence which, at the time it was found on the person of the respondent, was the product of a lawful arrest and a lawful search. To deter police from enforcing a presumptively valid statute was never remotely in the contemplation of even the most zealous advocate of the Exclusionary Rule.”
443 U.S. at 38 n. 3, 99 S.Ct. at 2633 n. 3. DeFillippo can be distinguished from the majority of cases because the appellant in that case would have had an incentive to challenge the constitutionality of the Detroit ordinance in defense to a criminal prosecution for the substantive crime it defines. In cases such as Ybarra or Almeida-Sanchez, in which the challenged statute itself purports to authorize an unconstitutional search, no such incentive would exist if the exclusionary rule were not applied.
In the instant case, the agents of , the DEA, like the officer in DeFillippo who made an arrest and subsequent search in reliance on the validity of the Detroit ordinance,13 seized Pappas’s ear pursuant to a literal reading of subsection 881(b)(4) that was uncontradicted by any prior judicial construction of the statute and was in accordance with standard DEA procedures. Moreover, since it is not clear that there would have been no incentive to challenge the seizure in the forfeiture proceeding, see United States v. One 1972 Chevrolet Nova, 560 F.2d 464, 467 (1st Cir. 1977), the unavailability of the exclusionary rule in a separate criminal prosecution would not have insulated the government’s improper construction of the statute, from attack. Thus, we find that application of the exclusionary rule is inappropriate in this case.14
[332]*332B.
Pappas posits as an independent ground for suppressing the firearm that the search, which occurred at DEA headquarters two days after the seizure, was not an “inventory” search, but rather an investigative search for evidence. We need not address the question whether such a warrant-less search would violate the Fourth Amendment, see United States v. Johnson, supra, 572 F.2d at 232-33, since, as we indicated above, the record does not support this characterization. The uncontradicted testimony of the DEA agent who conducted the search was that it was an inventory “pursuant to regulations in the Agent’s Manual”, and the magistrate found the search to have been a noninvestigative inventory. Pappas cites no facts in the record suggesting that the purported inventory was in fact “a pretext concealing an investigatory police motive.” South Dakota v. Opperman, supra, 428 U.S. at 376, 96 S.Ct. at 3100.
Pappas also argues that the doctrine permitting in-custody automobile searches applies only to local police and not federal law enforcement officers. We decline to make such a distinction. The interests justifying warrantless inventories by local police — protection of the police from liability and disputes over lost or stolen property and protection of the owner’s property while it is in custody — seem as apposite in assessing the constitutionality of the care-taking procedures of federal law enforcement officers.
The order of the district court is vacated.