Petitioner Elder was arrested without a warrant after respondents, Idaho police officers, surrounded his house and ordered him to come out. Alleging that the arrest violated his Fourth Amendment right to be secure against unreasonable seizure, Elder sued the officers for damages under 42 U.S.C. § 1983. The officers raised the defense of qualified immunity, which shields public officials from actions for damages unless their conduct was unreasonable in light of clearly established law. The District Court found the law clear that, absent exigent circumstances, a warrant would have been required had the arrest occurred inside the house. The court found it unclear, however, whether a warrant was needed when officers surrounded a house and requested an individual to come out and surrender. Finding no controlling state or Ninth Circuit case law, the court granted summary judgment for respondents. On appeal, the Court of Appeals noticed Ninth Circuit precedent in point missed in the District Court. United States v. Al-Azzawy, 784 F.2d 890, the Court of Appeals thought, might have alerted a reasonable officer to the constitutional implications of putting a suspect under arrest outside a surrounded house. The court held, however, that the Al-Azzawy decision could not be used to Elder's advantage. Although typing the qualified immunity inquiry a pure question of law, the court read this Court's decision in Davis v. Scherer, 468 U.S. 183, to require plaintiffs to present to the district court, as "legal facts," the cases showing that the right asserted was clearly established. Just as appellants forfeit facts not presented to the court of first instance, the Court of Appeals reasoned, so, in the peculiar context of civil rights qualified immunity litigation, a plaintiff may not benefit on appeal from a precedent neither he nor the district court itself mentioned in the first instance.
Held: Appellate review of qualified immunity dispositions must be conducted in light of all relevant precedents, not simply those cited to, or discovered by, the district court. The rule declared by the Court of Appeals in this case does not aid the qualified immunity doctrine's central objective — to protect public officials from undue interference with their duties and from potentially disabling threats of liability — because its operation is unpredictable in advance of the district court's adjudication. Nor does the rule further the interest in deterring public officials' unlawful actions and compensating victims of such conduct. Instead, it simply releases defendants because of shortages in counsels' or the court's legal research or briefing. The decision in Davis v. Scherer, supra, was misconstrued by the Court of Appeals. Davis did not concern what authorities a court may consider in determining qualified immunity. The Court held in Davis only this: To defeat qualified immunity, the federal right on which the claim for relief is based — rather than some other right — must be clearly established. Whether a federal right was clearly established at a particular time is a question of law, not "legal facts," and must be resolved de novo on appeal. A court of appeals reviewing a qualified immunity judgment should therefore use its full knowledge of its own and other relevant precedents. It is left to the Court of Appeals to consider, in light of all relevant authority, including Al-Azzawy, whether respondents are entitled to prevail on their qualified immunity defense. Pp. 514-516.
975 F.2d 1388, reversed and remanded.
GINSBURG, J., delivered the opinion for a unanimous Court.
JUSTICE GINSBURG delivered the opinion of the Court.
This case presents the question whether an appellate court, reviewing a judgment according public officials qualified immunity from a damages suit charging violation of a federal right, must disregard relevant legal authority not presented to, or considered by, the court of first instance. We hold that appellate review of qualified immunity dispositions is to be conducted in light of all relevant precedents, not simply those cited to, or discovered by, the district court.
I
In April, 1987, police officers in Idaho learned that Charles Elder was wanted by Florida authorities. They set out to arrest Elder, but did not obtain an Idaho arrest warrant. The officers planned to apprehend Elder at his workplace, in a public area where a warrant is not required. See United States v. Watson, 423 U.S. 411, 418, n. 6 (1976). Finding that Elder had already left his jobsite, the officers surrounded the house in which he resided and ordered him to come out. Elder suffered epileptic seizures during the episode and, an officer instructed him to crawl out of the house to avoid injury from falling. Elder, instead, walked through the doorway, immediately suffered another seizure, and fell on the concrete walk in front of the house. He sustained serious brain trauma and remains partially paralyzed.
II
Alleging that the warrantless arrest violated his Fourth Amendment right to be secure against unreasonable seizure, Elder sued the arresting officers for damages under 42 U.S.C. § 1983. The doctrine of qualified immunity shields public officials like respondents from damages actions unless their conduct was unreasonable in light of clearly established law. The District Court analyzed Elder's case in three steps. Had the arrest occurred inside the house, that court recognized, clear law would come into play: absent exigent circumstances, an arrest warrant would have been required. See 751 F. Supp. 858, 860 (Idaho 1990) (citing Payton v. New York, 445 U.S. 573 (1980)). If the same clear law governed Elder's arrest as it in fact transpired, the District Court said, then the matter of exigent circumstances would present a triable issue. 751 F. Supp., at 865. But, the District Court concluded, it was not clear that the warrant requirement applied when officers surrounded a house and requested an individual inside to come out and surrender. For that scenario, the one presented here, the District Court "found no controlling Idaho or Ninth Circuit case law." Id., at 866. The District Court accordingly granted summary judgment for the officers on qualified immunity grounds. See, e.g., Harlow v. Fitzgerald, 457 U.S. 800, 818 (1982) (officials "are shielded from liability for civil damages insofar as their conduct does not violate clearly established statutory or constitutional rights of which a reasonable person would have known").
According to depositions before the District Court, Elder had access to guns in the house, a consideration that might support an exigent circumstances plea. On the other hand, the police started to plan for the arrest five days before it occurred, a factor that might tug against a finding of exigency.
On appeal, the Ninth Circuit noticed precedent in point missed in the District Court: United States v. Al-Azzawy, 784 F.2d 890 (CA9 1985), cert. denied, 476 U.S. 1144 (1986). Al-Azzawy, the Court of Appeals observed, involved a suspect seized outside his surrounded home. The Al-Azzawy decision, published over a year before Elder's arrest, "might have alerted a reasonable officer to the constitutional implications of putting a suspect under arrest after he had come outside his house pursuant to an order to exit." 975 F.2d 1388, 1391-1392 (CA9 1991). Indeed, Al-Azzawy explicitly "reaffirmed the rule that "it is the location of the arrested person, and not the arresting agents, that determines whether an arrest occurs within a home.' [ Al-Azzawy, 784 F.2d at 893] (quoting United States v. Johnson, 626 F.2d 753, 757 (9th Cir. 1980), aff'd on other grounds, 457 U.S. 537 . . . (1982))." 975 F.2d, at 1391.
Elder's brief in the Court of Appeals did cite Al-Azzawy, albeit without elaboration. Brief for Appellant in No. 91-35146 (CA9), p. 9. There was cause for Elder's caution: the ultimate holding of Al-Azzawy was that exigent circumstances justified the warrantless arrest. Cf. n. 1, supra.
Elder could not benefit from the rule reaffirmed in Al-Azzawy, the Court of Appeals believed, because that precedent had been unearthed too late. For the conclusion that cases unmentioned in the District Court could not control on appeal, the Court of Appeals relied on Davis v. Scherer, 468 U.S. 183 (1984), in particular, on this statement from Davis: "A plaintiff who seeks damages for violation of constitutional or statutory rights may overcome the defendant official's qualified immunity only by showing that those rights were clearly established at the time of the conduct at issue." Id., at 197 (emphasis added).
Although typing the qualified immunity inquiry "a `pure questio[n] of law,'" 975 F.2d, at 1392 (quoting Romero v. Kitsap County, 931 F.2d 624, 627-628 (CA9 1991)), the Court of Appeals read Davis to require plaintiffs to put into the district court record, as "legal facts," the cases showing that the right asserted was "clearly established." 975 F.2d, at 1394. Just as appellants forfeit facts not presented to the court of first instance, the Ninth Circuit reasoned, so, in the peculiar context of civil rights qualified immunity litigation, a plaintiff may not benefit on appeal from precedent neither he nor the district court itself mentioned in the first instance: "[T]he plaintiff's burden in responding to a request for judgment based on qualified immunity is to identify the universe of statutory or decisional law from which the [district] court can determine whether the right allegedly violated was clearly established." Id., at 1392 we granted certiorari, 509 U.S. 921 (1993).
III
The central purpose of affording public officials qualified immunity from suit is to protect them "from undue interference with their duties and from potentially disabling threats of liability." Harlow v. Fitzgerald, 457 U.S., at 806. The rule announced by the Ninth Circuit does not aid this objective because its operation is unpredictable in advance of the district court's adjudication. Nor does the rule further the interests on the other side of the balance: deterring public officials' unlawful actions and compensating victims of such conduct. Instead, it simply releases defendants because of shortages in counsel's or the court's legal research or briefing.
The Ninth Circuit's rule could have a number of untoward effects. It could occasion appellate affirmation of incorrect legal results, see 984 F.2d 991, 998-999 (CA9 1993) (Kozinski, J., dissenting from denial of reh'g en banc), and it could place defense counsel in a trying situation. See ABA Model Rule of Professional Conduct 3.3(a) (1989 ed.) ("A lawyer shall not knowingly: . . . (3) fail to disclose to the tribunal legal authority in the controlling jurisdiction known to the lawyer to be directly adverse to the position of the client and not disclosed by opposing counsel.").
In thinking its rule compelled by this Court's instruction, the Ninth Circuit misconstrued Davis v. Scherer. The Court held in Davis that an official's clear violation of a state administrative regulation does not allow a § 1983 plaintiff to overcome the official's qualified immunity. Only in this context is the Court's statement comprehensible: "A plaintiff who seeks damages for violation of constitutional or statutory rights may overcome the defendant official's qualified immunity only by showing that those rights were clearly established. . . ." Davis v. Scherer, 468 U.S., at 197 (emphasis added). Davis, in short, concerned not the authorities a court may consider in determining qualified immunity, but this entirely discrete question: Is qualified immunity defeated where a defendant violates any clearly established duty, including one under state law, or must the clearly established right be the federal right on which the claim for relief is based? The Court held the latter. 468 U.S., at 193-196, and n. 14; see 984 F.2d 991, 995 (CA9 1993) (Kozinski, J., dissenting from denial of reh'g en banc).
Whether an asserted federal right was clearly established at a particular time, so that a public official who allegedly violated the right has no qualified immunity from suit, presents a question of law, not one of "legal facts." See Mitchell v. Forsyth, 472 U.S. 511, 528 (1985); Harlow v. Fitzgerald, 457 U.S., at 818. That question of law, like the generality of such questions, must be resolved de novo on appeal. See, e.g., Pierce v. Underwood, 487 U.S. 552, 558 (1988). A court engaging in review of a qualified immunity judgment should therefore use its "full knowledge of its own [and other relevant] precedents." See Davis, 468 U.S., at 192, n. 9.
We leave it to the Court of Appeals to consider, in light of all relevant authority, including Al-Azzawy, whether the respondent officers are entitled to prevail on their qualified immunity defense. We express no opinion on that ultimate issue, nor do we consider whether the officers' alternate plea of exigent circumstances is tenable.
* * *
For the reasons stated, the judgment of the Court of Appeals is reversed, and the case is remanded for further proceedings consistent with this opinion.
It is so ordered.
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