Plaintiff-appellant Andrew Powe filed this lawsuit against the City of Chicago and the County of Cook under section 1983, 42 U.S.C. § 1983. The district court granted defendants’ motions for summary judgment “as motions for judgment on the pleadings pursuant to F.R.C.P. 12(b)(6).” Powe appealed.
We note at the outset that because this appeal is from a dismissal of the complaint for failure to state a claim, the sole issue is the sufficiency of the complaint. We must therefore exclude from our discussion facts presented in the plaintiff’s and the defendants’ briefs that are based upon documents and deposition testimony obtained through discovery, but that are not alleged in the complaint. Rather,, our discussion is directed to the allegations that appear in the complaint.
See Glaros v. Perse,
I.
According to the complaint, in February of 1972 Powe was the victim of an armed robbery committed by one Ernest Brooks, who took, among other things, Pbwe’s wallet containing his identification. Brooks was later arrested for another crime, and, using Powe’s stolen identification, he pleaded guilty and was sentenced to two years' probation under the name “Andrew Powe.” He then violated probation, and a probation violation arrest warrant was issued, by the Cook County Adult Probation Department, on December 20, 1974, for the arrest of “Andrew Powe, a/k/a Ernest Brooks.” 2 *643 This warrant was lodged with the Cook County Sheriff’s Fugitive Warrant Section, and was placed as a “stop order” with the Chicago Police Department, “without adequate specificity to identify the intended arrestee.” Count I, Paragraph 12.
On November 25, 1975, the real Andrew Powe was stopped by Chicago police for a traffic offense. The police officers made a routine computer check, via police radio, for warrants outstanding against Powe. This check revealed the “Andrew Powe, a/k/a Ernest Brooks” arrest warrant. Powe was accordingly placed under arrest, was booked, fingerprinted and photographed, and spent the night in jail because he was unable to post the required bond until the following day. Powe appeared in court to answer the probation violation charge on December 1, 1975, and he then explained the circumstances to the judge. The case was continued, to permit the prosecutor to investigate. On December 30, 1975, the prosecutor reported to the judge that Powe’s story was true. Powe was therefore discharged.
Three months later, on March 8, 1976, Powe was stopped by Chicago police for speeding. Since he was driving on a traffic ticket at the time, he was taken to the Seventh District Station of the Chicago Police Department to post a $25 bond. While he was at the police station, a routine computer check was made for outstanding warrants, as before, and as before the probation violation warrant turned up. Powe was therefore taken to Central Detention Lockup at 11th and State Streets in Chicago, was booked, fingerprinted and photographed, and spent the night in jail. The following day a Cook County Probation Department employee, who had a photograph of the actual probation violator, informed the Chicago police officers at Central Lockup that Powe was not the man sought in the warrant. The Chicago police refused to release him promptly, however, and instead transported him in a squadrol, with his hands cuffed behind him, back to the Seventh District Station! He was not released from custody until “many hours later.”
Following the second arrest Powe filed this lawsuit. Thereafter, he was arrested twice more on the same warrant, once in January of 1977 and again on November 5, 1977. In this lawsuit, he seeks damages and injunctive relief under section 1983, and under pendent state counts of negligence and respondeat superior, for all four of his arrests, and for his retention in custody by the Chicago police, on the occasion of his second arrest, after they were notified that he was not the man sought under the warrant.
II.
Our task is to determine whether the complaint’s allegations, outlined above, suffice to state a cognizable claim for relief against the city and the county under section 1983. Both defendants are municipalities. The Supreme Court set forth the elements of a civil rights claim against a municipality in
Monell v. Department of Social Services of the City of New York,
*644 A. Deprivation of Liberty
Powe contends that he was deprived of his liberty without due process of law. The district court, relying on
Baker v. McCollan,
In the present case, the district court found that the warrant was conceded by all parties to be valid. Were we in accord with this premise, we would agree with the district court’s conclusion that the complaint must be dismissed under Baker. We are constrained to conclude, however, that the district court’s premise was incorrect.
At Count I, Paragraph 12 of the complaint, Powe charges that the warrant was “without adequate specificity to identify the intended arrestee.” At Count I, Paragraph 16, Powe charges that when the warrant was reissued after his first arrest, it was “likewise deficient in identifying the person to be arrested." Powe further complains that the warrant was issued in his name in spite of the knowledge on the part of the law enforcement agencies of the defendants that Brooks was “a person who employed several aliases.” Count I, Paragraph 17 (emphasis added). Finally, Powe’s challenge to the warrant was reiterated in the last brief he filed with the district court: in his brief in opposition to the defendants’ motion for summary judgment (the motion that resulted in the dismissal of the case and the appeal to this court), Powe argued that the unlawful detentions were “caused by the defective warrant. . . . [T]he defective warrant was the sina [sic] qua non of Plaintiff’s injury.” In view of these allegations and arguments, we cannot agree that Powe conceded the validity of the arrest warrant.
This court has held that where an arrest is made pursuant to an invalid warrant,
Baker
cannot be applied to preclude the arrestee’s claim of an unconstitutional deprivation of liberty.
Murray v. Chicago,
*645 The fourth amendment to the Constitution states:
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
(Emphasis added.)
An arrest warrant that correctly names the person to be arrested generally satisfies the fourth amendment’s particularity requirement, and no other description of the arrestee need be included in the warrant.
See Wanger v. Bonner,
The earliest and most important case to discuss the fourth amendment’s particularity requirement is
West v. Cabell,
By the common law, a warrant for the arrest of a person charged with crime must truly name him, or describe him sufficiently to identify him.
******
The principle of the common law, by which warrants of arrest, in cases criminal or civil, must specifically name or describe the person to be arrested, has been affirmed in the American constitutions; and by the great weight of authority in this county a warrant that does not do so will not justify the officer making the arrest.
*646
Id.
at 85-86,
The
West
rule, that an arrest warrant must “truly name [the arrestee] or describe him sufficiently to identify him,” is today regularly used as the point of reference for adjudging the particularity of a warrant. Not surprisingly, numerous cases invoking
West
concern John Doe warrants, which by their nature never “truly name” the intended arrestee.
6
Thus, for example, the court in
Bozeman
v.
City of Buffalo,
A warrant was held invalid, however, in
United States v. Swanner,
West
was also invoked in a case not involving a John Doe warrant,
McCoy v. State,
The foregoing cases make clear that West’s admonition that an arrest warrant must “truly name [the arrestee] or describe him sufficiently to identify him” is applicable to a broad spectrum of cases involving quite different factual settings but containing a crucial common factor. In each case, the law enforcement authorities had probable cause to suspect a particular person of committing a crime, but did not know his name, 9 or were uncertain of his name. 10
The same factor is present in the case now before us. Here, it is clear from *647 the complaint that the authorities had probable cause to believe that the man (allegedly named Ernest Brooks) who was arrested, charged, convicted and sentenced for a crime had violated his probation. It is also clear from the complaint that the authorities were not certain of his name: the first warrant was, allegedly, issued in two names, and the authorities allegedly knew their suspect used “several” aliases. Where the authorities do not know, or are uncertain of the intended arrestee’s name, then the name placed on the warrant — be it James West, or John Doe, or John Doe alias Bud Ferguson, or Andrew Powe a/k/a Ernest Brooks — is, to one degree or another, arbitrary. While an arrest warrant may constitutionally use such arbitrary name designations, it may only do so if, in addition to the name, it also gives some other description of the intended arrestee that is sufficient to identify him.
The description need not be of the intended arrestee’s physical appearance, although that is usually the description given. In
McCoy, supra,
the description consisted of the suspect’s nickname and his correct address.
See Bozeman, supra,
in which the court stated that a John Doe warrant must contain “the best description possible” of the suspect, which may consist of “his appearance, occupation, residence and any other circumstances through which he could be identified.”
We do not hold that every arrest is necessarily invalid whenever it incorrectly names the intended arrestee and contains no other description of him. A case may be hypothesized in which the authorities responsible for preparing the warrant have good reason to believe that the name on the warrant is the real name of the intended arrestee, and have no reason to suspect otherwise. Our holding here is not addressed to such a case. In this case our holding is simply that where, as is alleged here, the authorities had reason to suspect that the name placed on the warrant was not the real name of the intended arrestee, then some other description of the intended arrestee, sufficient to identify him, must be included in the warrant.
Strict compliance with this rule is essential to preserve the fundamental principle, embodied in the fourth amendment, that “every citizen is entitled to security of his person and property unless and until an
adequate justification
for disturbing that security is shown.” Amsterdam,
Perspectives on the Fourth Amendment,
58 Minn.L.Rev. 349, 411 (1974) (emphasis added). We quite agree with the defendants that the fourth amendment does not guarantee that only the guilty will be arrested; this truism was most recently reiterated by the Supreme Court in
Baker v. McCollan, supra,
We hold, therefore, that the complaint adequately alleges the probation-violation warrant was invalid for failure to satisfy the fourth amendment’s particularity requirement. In light of this allegation, the district court’s reliance on
Baker v. MeCollan, supra,
in dismissing the complaint, was erroneous. As we noted earlier, where an arrest is based on an invalid warrant,
Baker
does not preclude recovery under section 1983 for an unconstitutional deprivation of liberty.
Murray v. City of Chicago, supra,
Before we leave this first prong of the Monell prima facie case, we must comment on the adequacy of the complaint to allege that Powe’s arrests were made pursuant to the allegedly invalid warrant. Powe alleges that at his first arrest he was initially stopped for a traffic offense. He does not contest this initial stop, and nothing in his complaint suggests that it was improper. Nonetheless, it is clear from a fair reading of his complaint that he was taken into custody, after the initial stop, on the basis of the challenged probation-violation warrant. The same is true of Powe’s allegations regarding his second arrest. He does not contest his initial stop for speeding, nor does he contest being taken to the police station to post a $25.00 bond. However, as with the first arrest, the complaint makes clear that he was booked and held on bail because of the probation-violation warrant, not because of the traffic violation. We see no inadequacy in the allegations regarding the first two arrests.
However, as to the third and fourth detentions, Powe’s allegations, on their face, are problematic. His allegation regarding the third arrest reads, in full:
*649 On or about January, 1977, after the filing of the original Complaint herein, Plaintiff was unlawfully arrested, incarcerated and detained at the Chicago Police District Station located at 840 E. 75th Street, Chicago, Illinois and was again fingerprinted, photographed and a record made of his arrest.
Count I, Paragraph 24A. The allegation regarding the fourth arrest reads, in full:
On or about November 5, 1977, after the filing of the original Complaint in this case, Plaintiff was unlawfully arrested, incarcerated and detained at the Chicago Police District Station located at 840 E. 75th Street, Chicago, Illinois and was again fingerprinted, photographed and a record made of his arrest.
Count I, Paragraph 24B. Although these paragraphs allege in conclusory fashion that the third and fourth detentions were “unlawful,” they contain no mention of any facts or circumstances that render the arrests unlawful. Because Powe’s pleadings were drafted by an attorney, we do not look with favor upon these conclusions of law that are not supported by factual allegations. Notwithstanding our misgivings, however, we conclude that the allegations of the third and fourth arrests do state a claim. First, we view them in the light of the detailed allegations of the first two arrests. While we would prefer more precision in the drafting, the most reasonable interpretation is that the third and fourth arrests were “unlawful” because they were made pursuant to the challenged warrant. Second, and of far greater importance, it is quite clear that the defendants have not been prejudiced. They acknowledge in their briefs to this court that the challenged warrant was, indeed, the basis for the third and fourth arrests. 13 In light of these special circumstances, we conclude that the allegations regarding Powe’s third and fourth detentions are not fatally insufficient.
In sum, we hold that Powe’s complaint adequately alleges that on four occasions he was deprived of his liberty on the basis of a constitutionally defective arrest warrant. The complaint therefore satisfies the first prong of the Monell prima facie case.
B. Policy
We now turn to the second prong of the Monell prima facie case. The defendants argue that Powe’s complaint fails to allege an unconstitutional policy of the city or the county and therefore, under Monell, fails to state a claim. We begin our discussion of this argument with a brief examination of Monell’s requirement of a showing of policy-
The requirement of a showing of policy stems from the Monell Court’s explicit rejection of a respondeat superior theory in suits against municipal entities under section 1983. This rejection of respondeat superior is based upon the principle that a defendant must be somehow at fault in order to be held liable for damages under section 1983. That is, a municipality may be cast in damages only for its own acts or omissions, and a municipality “acts” by establishing or countenancing policies or practices which its employees are expected to follow in performing their duties. This predication of liability upon fault means that when an individual official breaks with official policy, and in doing so violates the constitutional rights of another, then that official, and not the municipality whose policies he breached, should be made to bear the liability. Conversely, when an official performs his duties according to established policies or practices, but in doing so violates another’s rights, then it is the municipal entity, which established or perpetuated the practices, that should be held liable.
*650
With the foregoing in mind, and without wishing to quibble over semantics, we note that the defendants’ formulation of the issue — whether the city or the county instituted an “unconstitutional policy” — might lead to some misunderstanding. Under
Monell,
the policy of the municipality is not to be examined, in a vacuum, for unconstitutionality. Rather, under
Monell,
the crucial question is whether the unconstitutional acts complained of were
caused by
a policy or custom of the municipality.
See Monell,
In Monell, since the plaintiffs explicitly attacked the municipal department’s official policy of forcing pregnant women to take unpaid leaves of absence, the Supreme Court had no occasion to consider when an official policy or custom should be inferred from a complaint’s allegations. Cases following Monell, however, have considered this question, and these cases suggest that, normally, the mere allegation of a single act of unconstitutional conduct by a municipal employee will not support the inference that such conduct was pursuant to official policies. On the other hand, where the plaintiff alleges a pattern or a series of incidents of unconstitutional conduct, then the courts have found an allegation of policy sufficient to withstand a dismissal motion.
The leading case is
Turpin v. Mailet,
Turpin
reflects the prevailing view with respect to allegations of municipal policy in suits under section 1983. The allegation of a single incident of unconstitutional conduct by a municipal employee usually does not establish a sufficient basis for suing the municipality. As this court held in
Sterling v. Village of Maywood,
By contrast, the allegation of a pattern of conduct or a series of acts violative of constitutional rights will in many cases raise an inference of municipal policy. In
Glaros v. Perse,
In the present case, Powe has alleged that he was the victim of a series of unlawful arrests, each arrest based upon the same, allegedly invalid, warrant. In our view, his allegations are sufficient to raise the inference that the municipal defendants are responsible for the challenged arrests. The complaint indicates that the challenged probation-violation warrant was prepared, promulgated, and executed by various employees of separate departments of the defendants’ law enforcement agencies. Assuming the warrant was invalid, its invalidity would lie, as we discussed in part II A above, in the failure of the municipal authorities to include in the warrant an adequate description of the person sought. This failure to describe the arrestee was repeated four times. We find it reasonable to infer that the inadequacy of the description in the warrant was systemic in nature — that is, that it resulted from the procedures followed by the defendants’ law enforcement agencies in issuing warrants of the type involved here. Given this reasonable inference, we must conclude that Powe is entitled to maintain his suit against the defendant municipalities. Clearly, under Monell, the 'municipalities must be held liable under section 1983 if the factfinder determines that their procedures led to the issuance of an invalid warrant against Powe, and, thereby, to his unlawful arrests. Given the allegations contained in Powe’s complaint, such a conclusion would be entirely permissible. Accordingly, we hold that Powe’s complaint satisfies the second prong of the Monell prima facie case.
III. Continued Detention after the Second Arrest
We address briefly the district court’s holding with respect to Powe’s continued detention by the Chicago police for “many hours” after they became aware that he was not the intended arrestee. The district court held that “[a] claim for this deprivation of liberty or due process by the City is not cognizable under Baker v. McCollan, supra, if the arrest itself is proper.” We have serious reservations about this rationale. The Baker Court held that, after a valid arrest pursuant to a valid warrant, the continued detention of the arrestee until it was discovered that he was *652 not the person sought, was perfectly valid, even though such detention lasted several days. Nothing in Baker compels the conclusion that the validity of the arrest renders utterly unassailable the continued detention of the arrestee after it is discovered that he is not the person sought. We need not and do not decide this issue, however, because we are satisfied that this part of the district court’s holding should be affirmed, albeit on different grounds.
Even assuming arguendo that the continued detention amounted to a deprivation of liberty without due process of law, Powe may not maintain a suit against the City for the continued detention because his complaint does not adequately allege “policy” within the meaning of Monell. The complaint contains no direct allegation that the Chicago Police Department regularly, as a matter of practice, detains arrestees for an unreasonable time after it is clear that there is no longer any cause to hold them. Nor, as we discussed in Part II B, supra, can we draw any such inference from the allegation of a single incident of undue detention. See ante, at 650-51, and cases cited therein. We conclude that Powe has not made out a claim against the City of Chicago for his continued detention on the occasion of his second arrest.
IV. Attorneys’ Fees
Finally, Powe has requested attorneys’ fees under section 1988, 42 U.S.C. § 1988. He is not entitled to attorneys’ fees until he has “prevailed on the merits of at least some of his claims.”
Hanrahan v. Hampton,
V. Conclusion
For the reasons stated, we hold that Powe’s complaint states a claim for relief against the City of Chicago and the County of Cook for adopting policies or procedures that led to the repeated issuance of a constitutionally defective arrest warrant and, thus, to his unlawful arrests. The dismissal of that portion of his complaint was therefore erroneous. We also hold that Powe has failed to state a claim against the City of Chicago for his continued detention by members of the Chicago Police Department after they were made aware that there was no longer reason to hold him. Finally, we hold that Powe is not entitled to attorneys’ fees at this stage of the litigation.
The order of the district court is affirmed in part and reversed in part. The case is remanded for further proceedings consistent with the views expressed herein.
Notes
. At oral argument, counsel for Mr. Powe made several references to the Third Amended Complaint. That complaint is not properly before us. Counsel withdrew it voluntarily before the district court’s final decision was rendered. The complaint that the district court dismissed was the Second Amended Complaint as Amended.
. We feel it necessary to point out that Ernest Brooks is evidently not the real name of Powe’s attacker. After the complaint was filed, Powe obtained an arrest record, from defendant City of Chicago, which indicates that the robber’s real name is Earl Doty. According to the arrest record, “Ernest Brooks” is simply another of numerous aliases Doty has used when arrested by the Chicago police. Like the alias *643 “Andrew Powe,” Doty only used the alias “Ernest Brooks” once. It appears that the complaint refers to him as Brooks because the warrant named “Powe” and “Brooks.” We refer to him here as Brooks because the complaint does so. That his real name is Earl Doty is not relevant to the issues presented.
.
Monell
applies in this case even though the suit was filed before the
Monell
decision was handed down.
See, e. g.. Sterling v. Village of Maywood,
. Although the principal basis for the Supreme Court’s holding was the validity of the warrant, the Court also relied, in part, on the
de mini-mus
nature of the confinement: he was arrested only once and, on that sole occasion, detained for only “three days over a New Year’s weekend
Id.
at 145,
. The jurisdictional basis for the suit was a bond executed by the marshal, “the condition of which was that the marshal, by himself and his deputies, should faithfully perform all the duties of his office, and upon which any person injured by a breach of the condition might maintain an action. Rev.Stat. §§ 783, 784;
Lammon v. Feusier,
. The
West
Court itself used the example of John Doe warrants to illustrate the requirement of a description in the warrant where the “true name” of the arrestee could not be given. A John Doe warrant must always include a description, the Court stated, for otherwise it is “in effect a general warrant, upon which any other person might as well [be] arrested, as being included in the warrant.”
. The court upheld a later version of the warrant, however, which was supplemented by the inclusion of a more detailed physical description of the suspect and the correct name, address and description of his accomplice, in whose home he was likely to be found.
. The Montoya court upheld the arrest, however, on the ground that the arrestee had committed a felony in the officer’s presence. Id. at 73.
. Montoya; $1,058.00 in United States Currency.
. West v. Cabell; McCoy; Swanner.
. By analogy, we note that courts have held search warrants not sufficiently particularized where they created too great a risk of governmental intrusion upon nonsuspects. Thus, in
United States v. Prout,
[T]he determining factor as to whether a search warrant describes the premises to be searched with sufficient particularity is not whether the description given is technically accurate in every detail but rather whether the description is sufficient to enable the executing officer to locate and identify the premises with reasonable effort, and whether there is any reasonable probability that another premises might be mistakenly searched which is not the one intended to be searched under the search warrant.
Id.
at 387-88, quoting
United States v. Sklaroff,
This circuit follows the rule articulated above. In
United States v. Hinton,
. Similarly, defendant City of Chicago’s reliance on
Johnson v. City of St. Paul,
. It appears from these briefs and from Powe’s brief to this court that, like the first two arrests, the later arrests were occasioned by initial police contact which was not improper. Apparently, at the third arrest, Powe had gone to a police station to pay a number of outstanding parking tickets. The routine check was made, the probation-violation warrant was discovered, and he was arrested. At the fourth arrest, Powe was initially stopped for not having a Chicago inspection sticker on his car.
. The court in Turpin proceeded to reverse the jury verdict in the plaintiffs favor, however, for lack of sufficient evidence of harassment. Id. at 204.
. The question before the Glaros court was whether the plaintiff should have been permitted to amend his complaint to include this allegation.
