Justice Brennan
delivered the opinion of the Court.
This case presents the question whether a municipal ordinance that makes it unlawful to interrupt a police officer in the performance of his or her duties is unconstitutionally overbroad under the First Amendment.
I — I
Appellee Raymond Wayne Hill is a lifelong resident of Houston, Texas. At the time this lawsuit began, he worked as a paralegal and as executive director of the Houston Human Rights League. A member of the board of the Gay Political Caucus, which he helped found in 1975, Hill was also affiliated with a Houston radio station, and had carried city and county press passes since 1975. He lived in Montrose, a “diverse and eclectic neighborhood” that is the center of gay political and social life in Houston. App. 26-27.
The incident that sparked this lawsuit occurred in the Mon-trose area on February 14, 1982. Hill observed a friend, Charles Hill, intentionally stopping traffic on a busy street, evidently to enable a vehicle to enter traffic. Two Houston police officers, one of whom was named Kelley, approached Charles and began speaking with him. According to the District Court, “shortly thereafter” Hill began shouting at the officers “in an admitted attempt to divert Kelley’s attention from Charles Hill.” App. to Juris. Statement B-2.1 Hill [454]*454first shouted: “Why don’t you pick on somebody your own size? ” After Officer Kelley responded: “[A]re you interrupting me in my official capacity as a Houston police officer?” Hill then shouted: “Yes, why don’t you pick on somebody my size?” App. 40-41, 58, 71-74. Hill was arrested under Houston Code of Ordinances, §34-ll(a), for “wilfully or intentionally interrupting] a city policeman ... by verbal challenge during an investigation.” App. 2. Charles Hill was not arrested. Hill was then acquitted after a nonjury trial in Municipal Court.2
[455]*455Code of Ordinances, City of Houston, Texas, §34-ll(a) (1984), reads:
“Sec. 34-11. Assaulting or interfering with policemen, “(a) It shall be unlawful for any person to assault, strike or in any manner oppose, molest, abuse or interrupt any policeman in the execution of his duty, or any person summoned to aid in making an arrest.”3
Following his acquittal in the Charles Hill incident, Hill brought the suit in the Federal District Court for the Southern District of Texas, seeking (1) a declaratory judgment that §34-11(a) was unconstitutional both on its face and as it had been applied to him, (2) a permanent injunction against any attempt to enforce the ordinance, (3) an order expunging the records of his arrests under the ordinance, and (4) damages and attorney’s fees under 42 U. S. C. §§ 1983 and 1988.
At trial, Hill introduced records provided by the city regarding both the frequency with which arrests had been made for violation of the ordinance and the type of conduct with which those arrested had been charged. He also introduced evidence and testimony concerning the arrests of several reporters under the ordinance. Finally, Hill introduced evidence regarding his own experience with the ordinance, under which he has been arrested four times since 1975, but never convicted.
The District Court held that Hill’s evidence did not demonstrate that the ordinance had been unconstitutionally applied.4 The court also rejected Hill’s contention that the [456]*456ordinance was unconstitutionally vague or overbroad on its face. The ordinance was not vague, the court stated, because:
“[t]he wording of the ordinance is sufficiently definite to put a person of reasonable intelligence on fair notice of what actions are forbidden. In particular, the Court finds that the use of words such as ‘interrupt’ are sufficiently clear by virtue of their commonly-understood, everyday definitions. Interrupt commonly means to cause one to cease, such as stopping someone in the middle of something. The Plaintiff, for example, clearly ‘interrupted’ the police officers regarding the Charles Hill incident.” App. to Juris. Statement B-8.
The court also held that the statute was not overbroad because “the ordinance does not, at least facially, proscribe speech or conduct which is protected by the First Amendment.” Id., at B-12.
A panel of the Court of Appeals reversed. 764 F. 2d 1156 (CA5 1985). The city’s suggestion for rehearing en banc was granted, and the Court of Appeals, by a vote of 8-7, upheld the judgment of the panel. 789 F. 2d 1103 (1986). The Court of Appeals agreed with the District Court’s conclusion that the ordinance was not vague, and that it “plainly encom-passe[d] mere verbal as well as physical conduct.” Id., at 1109. Applying the standard established in Broadrick v. Oklahoma, 413 U. S. 601 (1973), however, the Court of Appeals concluded that the ordinance was substantially [457]*457overbroad. It found that “[a] significant range of protected speech and expression is punishable and might be deterred by the literal wording of the statute.” 789 F. 2d, at 1110.
The Court of Appeals also reviewed the evidence of the unconstitutional application of the ordinance which Hill had introduced at trial. The court did not disturb the District Court’s ruling that the statute had not been unconstitutionally applied to Hill or to the reporters. It did. conclude, however, that other evidence not mentioned by the District Court revealed “a realistic danger of, and a substantial potential for, the unconstitutional application of the ordinance.” Ibid. This evidence showed that the ordinance “is officially regarded as penalizing the mere interruption of a policeman while in the line of duty,” id., at 1109, and has been employed to make arrests for, inter alia, “arguing,” “[t]alking,” “[i]n-terfering,” “[f]ailing to remain quiet,” “[r]efusing to remain silent,” “[vjerbal abuse,” “[c]ursing,” “[v]erbally yelling,” and “[t]alking loudly, [wjalking through scene.” Id., at 1113-1114.5
The city appealed, claiming that the Court of Appeals erred in holding the ordinance facially overbroad and in not abstaining until the ordinance had been construed by the [458]*458state courts.6 We noted probable jurisdiction, 479 U. S. 811 (1986), and now affirm.
hH HH
The elements of First Amendment overbreadth analysis are familiar. Only a statute that is substantially overbroad may be invalidated on its face. New York v. Ferber, 458 U. S. 747, 769 (1982); Broadrick v. Oklahoma, supra. “We have never held that a statute should be held invalid on its face merely because it is possible to conceive of a single impermissible application... .” Id., at 630 (Brennan, J., dissenting). Instead, “[i]n a facial challenge to the overbreadth and vagueness of a law, a court’s first task is to determine whether the enactment reaches a substantial amount of constitutionally protected conduct.” Hoffman Estates v. The Flipside, Hoffman Estates, Inc., 455 U. S. 489, 494 (1982); [459]*459
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Justice Brennan
delivered the opinion of the Court.
This case presents the question whether a municipal ordinance that makes it unlawful to interrupt a police officer in the performance of his or her duties is unconstitutionally overbroad under the First Amendment.
I — I
Appellee Raymond Wayne Hill is a lifelong resident of Houston, Texas. At the time this lawsuit began, he worked as a paralegal and as executive director of the Houston Human Rights League. A member of the board of the Gay Political Caucus, which he helped found in 1975, Hill was also affiliated with a Houston radio station, and had carried city and county press passes since 1975. He lived in Montrose, a “diverse and eclectic neighborhood” that is the center of gay political and social life in Houston. App. 26-27.
The incident that sparked this lawsuit occurred in the Mon-trose area on February 14, 1982. Hill observed a friend, Charles Hill, intentionally stopping traffic on a busy street, evidently to enable a vehicle to enter traffic. Two Houston police officers, one of whom was named Kelley, approached Charles and began speaking with him. According to the District Court, “shortly thereafter” Hill began shouting at the officers “in an admitted attempt to divert Kelley’s attention from Charles Hill.” App. to Juris. Statement B-2.1 Hill [454]*454first shouted: “Why don’t you pick on somebody your own size? ” After Officer Kelley responded: “[A]re you interrupting me in my official capacity as a Houston police officer?” Hill then shouted: “Yes, why don’t you pick on somebody my size?” App. 40-41, 58, 71-74. Hill was arrested under Houston Code of Ordinances, §34-ll(a), for “wilfully or intentionally interrupting] a city policeman ... by verbal challenge during an investigation.” App. 2. Charles Hill was not arrested. Hill was then acquitted after a nonjury trial in Municipal Court.2
[455]*455Code of Ordinances, City of Houston, Texas, §34-ll(a) (1984), reads:
“Sec. 34-11. Assaulting or interfering with policemen, “(a) It shall be unlawful for any person to assault, strike or in any manner oppose, molest, abuse or interrupt any policeman in the execution of his duty, or any person summoned to aid in making an arrest.”3
Following his acquittal in the Charles Hill incident, Hill brought the suit in the Federal District Court for the Southern District of Texas, seeking (1) a declaratory judgment that §34-11(a) was unconstitutional both on its face and as it had been applied to him, (2) a permanent injunction against any attempt to enforce the ordinance, (3) an order expunging the records of his arrests under the ordinance, and (4) damages and attorney’s fees under 42 U. S. C. §§ 1983 and 1988.
At trial, Hill introduced records provided by the city regarding both the frequency with which arrests had been made for violation of the ordinance and the type of conduct with which those arrested had been charged. He also introduced evidence and testimony concerning the arrests of several reporters under the ordinance. Finally, Hill introduced evidence regarding his own experience with the ordinance, under which he has been arrested four times since 1975, but never convicted.
The District Court held that Hill’s evidence did not demonstrate that the ordinance had been unconstitutionally applied.4 The court also rejected Hill’s contention that the [456]*456ordinance was unconstitutionally vague or overbroad on its face. The ordinance was not vague, the court stated, because:
“[t]he wording of the ordinance is sufficiently definite to put a person of reasonable intelligence on fair notice of what actions are forbidden. In particular, the Court finds that the use of words such as ‘interrupt’ are sufficiently clear by virtue of their commonly-understood, everyday definitions. Interrupt commonly means to cause one to cease, such as stopping someone in the middle of something. The Plaintiff, for example, clearly ‘interrupted’ the police officers regarding the Charles Hill incident.” App. to Juris. Statement B-8.
The court also held that the statute was not overbroad because “the ordinance does not, at least facially, proscribe speech or conduct which is protected by the First Amendment.” Id., at B-12.
A panel of the Court of Appeals reversed. 764 F. 2d 1156 (CA5 1985). The city’s suggestion for rehearing en banc was granted, and the Court of Appeals, by a vote of 8-7, upheld the judgment of the panel. 789 F. 2d 1103 (1986). The Court of Appeals agreed with the District Court’s conclusion that the ordinance was not vague, and that it “plainly encom-passe[d] mere verbal as well as physical conduct.” Id., at 1109. Applying the standard established in Broadrick v. Oklahoma, 413 U. S. 601 (1973), however, the Court of Appeals concluded that the ordinance was substantially [457]*457overbroad. It found that “[a] significant range of protected speech and expression is punishable and might be deterred by the literal wording of the statute.” 789 F. 2d, at 1110.
The Court of Appeals also reviewed the evidence of the unconstitutional application of the ordinance which Hill had introduced at trial. The court did not disturb the District Court’s ruling that the statute had not been unconstitutionally applied to Hill or to the reporters. It did. conclude, however, that other evidence not mentioned by the District Court revealed “a realistic danger of, and a substantial potential for, the unconstitutional application of the ordinance.” Ibid. This evidence showed that the ordinance “is officially regarded as penalizing the mere interruption of a policeman while in the line of duty,” id., at 1109, and has been employed to make arrests for, inter alia, “arguing,” “[t]alking,” “[i]n-terfering,” “[f]ailing to remain quiet,” “[r]efusing to remain silent,” “[vjerbal abuse,” “[c]ursing,” “[v]erbally yelling,” and “[t]alking loudly, [wjalking through scene.” Id., at 1113-1114.5
The city appealed, claiming that the Court of Appeals erred in holding the ordinance facially overbroad and in not abstaining until the ordinance had been construed by the [458]*458state courts.6 We noted probable jurisdiction, 479 U. S. 811 (1986), and now affirm.
hH HH
The elements of First Amendment overbreadth analysis are familiar. Only a statute that is substantially overbroad may be invalidated on its face. New York v. Ferber, 458 U. S. 747, 769 (1982); Broadrick v. Oklahoma, supra. “We have never held that a statute should be held invalid on its face merely because it is possible to conceive of a single impermissible application... .” Id., at 630 (Brennan, J., dissenting). Instead, “[i]n a facial challenge to the overbreadth and vagueness of a law, a court’s first task is to determine whether the enactment reaches a substantial amount of constitutionally protected conduct.” Hoffman Estates v. The Flipside, Hoffman Estates, Inc., 455 U. S. 489, 494 (1982); [459]*459Kolender v. Lawson, 461 U. S. 352, 359, n. 8 (1983). Criminal statutes must be scrutinized with particular care, e. g., Winters v. New York, 333 U. S. 607, 515 (1948); those that make unlawful a substantial amount of constitutionally protected conduct may be held facially invalid even if they also have legitimate application. E. g., Kolender, supra, at 359, n. 8.
The city’s principal argument is that the ordinance does not inhibit the exposition of ideas, and that it bans “core criminal conduct” not protected by the First Amendment. Brief for Appellant 12. In its view, the application of the ordinance to Hill illustrates that the police employ it only to prohibit such conduct, and not “as a subterfuge to control or dissuade free expression.” Ibid. Since the ordinance is “content-neutral,” and since there is no evidence that the city has applied the ordinance to chill particular speakers or ideas, the city concludes that the ordinance is not substantially overbroad.7
[460]*460We disagree with the city’s characterization for several reasons. First, the enforceable portion of the ordinance deals not with core criminal conduct, but with speech. As the city has conceded, the language in the ordinance making it unlawful for any person to “assault” or “strike” a police officer is pre-empted by the Texas Penal Code. Reply Brief for Appellant 10. The city explains, ibid., that “any species of physical assault on a police officer is encompassed within the provisions [§§22.01, 22.02] of the Texas Penal Code,”8 and under § 1.08 of the Code, “[n]o governmental subdivision or agency may enact or enforce a law that makes any conduct covered by this code an offense subject to a criminal penalty.” [461]*461Tex. Penal Code Ann. § 1.08 (1974). See Knott v. State, 648 S. W. 2d 20 (Tex. App. 1983) (reversing conviction obtained under municipal ordinance pre-empted by state penal code). Accordingly, the enforceable portion of the ordinance makes it “unlawful for any person to ... in any manner oppose, molest, abuse or interrupt any policeman in the execution of his duty,” and thereby prohibits verbal interruptions of police officers.9
Second, contrary to the city’s contention, the First Amendment protects a significant amount of verbal criticism and challenge directed at police officers. “Speech is often provocative and challenging. . . . [But it] is nevertheless protected against censorship or punishment, unless shown likely to produce a clear and present danger of a serious substantive evil that rises far above public inconvenience, annoyance, or unrest.” Terminiello v. Chicago, 337 U. S. 1, 4 (1949). In Lewis v. City of New Orleans, 415 U. S. 130 (1974), for example, the appellant was found to have yelled obscenities and threats at an officer who had asked appellant’s husband to produce his driver’s license. Appellant was convicted under a municipal ordinance that made it a crime “ Tor any person wantonly to curse or revile or to use obscene or opprobrious language toward or with reference to any member of the city police while in the actual performance of his duty.’” Id., at 132 (citation omitted). We vacated the conviction and invalidated the ordinance as facially overbroad. Critical to our decision was the fact that the ordinance “punishe[d] only spoken words” and was not limited in scope to fighting words that “‘by their very utterance [462]*462inflict injury or tend to incite an immediate breach of the peace.’” Id., at 133, quoting Gooding v. Wilson, 405 U. S. 518, 525 (1972); see also ibid. (Georgia breach-of-peace statute not limited to fighting words held facially invalid). Moreover, in a concurring opinion in Lewis, Justice Powell suggested that even the “fighting words” exception recognized in Chaplinsky v. New Hampshire, 315 U. S. 568 (1942), might require a narrower application in cases involving words addressed to a police officer, because “a properly trained officer may reasonably be expected to ‘exercise a higher degree of restraint’ than the average citizen, and thus be less likely to respond belligerently to ‘fighting words.’” 415 U. S., at 135 (citation omitted).
The Houston ordinance is much more sweeping than the municipal ordinance struck down in Lewis. It is not limited to fighting words nor even to obscene or opprobrious language, but prohibits speech that “in any manner . . . interrupt[s]” an officer.10 The Constitution does not allow such speech to be made a crime.11 The freedom of individuals ver[463]*463bally to oppose or challenge police action without thereby risking arrest is one of the principal characteristics by which we distinguish a free nation from a police state.12
[464]*464The city argues, however, that even if the ordinance encompasses some protected speech, its sweeping nature is both inevitable and essential to maintain public order. The city recalls this Court’s observation in Smith v. Goguen, 415 U. S. 566, 581 (1974):
“There are areas of human conduct where, by the nature of the problems presented, legislatures simply cannot establish standards with great precision. Control of the broad range of disorderly conduct that may inhibit a policeman in the performance of his official duties may be one such area requiring as it does an on-the-spot assessment of the need to keep order.”
The city further suggests that its ordinance is comparable to the disorderly conduct statute upheld against a facial challenge in Colten v. Kentucky, 407 U. S. 104 (1972).
[465]*465This Houston ordinance, however, is not narrowly tailored to prohibit only disorderly conduct or fighting words,13 and in no way resembles the law upheld in Colten.
“This ordinance, as construed by the Louisiana Supreme Court, confers on police a virtually unrestrained power to arrest and charge persons with a violation. Many arrests are made in ‘one-on-one’ situations where the only witnesses are the arresting officer and the person charged. All that is required for conviction is that the court accept the testimony of the officer that obscene or opprobrious language had been used toward him while in the performance of his duties.*. . .
“Contrary to the city’s argument, it is unlikely that limiting the ordinance’s application to genuine ‘fighting words’ would be incompatible with the full and adequate performance of an officer’s duties. . . . [I]t is usually unnecessary [to charge a person] with the less serious offense of addressing obscene words to the officer. The present type of ordinance tends to be invoked only where there is no other valid basis for arresting an objectionable or suspicious person. The opportunity for abuse, especially where a statute has received a virtually open-ended interpretation, is self-evident.
415 U. S., at 135-136, and n.
Houston’s ordinance criminalizes a substantial amount of constitutionally protected speech, and accords the police unconstitutional discretion in enforcement. The ordinance’s plain language is admittedly violated scores of times daily, App. 77, yet only some individuals — those chosen by the po[467]*467lice in their unguided discretion — are arrested. Far from providing the “breathing space” that “First Amendment freedoms need ... to survive,” NAACP v. Button, 371 U. S. 415, 433 (1963), the ordinance is susceptible of regular application to protected expression. We conclude that the ordinance is substantially overbroad, and that the Court of Appeals did not err in holding it facially invalid.
H-n I — I h — I
The city has also urged us not to reach the merits of Hill s constitutional challenge, but rather to abstain for reasons related to those underlying our decision in Railroad Comm'n v. Pullman Co., 312 U. S. 496 (1941). In its view, there are certain limiting constructions readily available to the state courts that would eliminate the ordinance’s overbreadth.16
Abstention is, of course, the exception and not the rule, Colorado River Water Conservation Dist. v. United States, 424 U. S. 800, 813 (1976), and we have been particularly reluctant to abstain in cases involving facial challenges based on the First Amendent.17 We have held that “abstention ... is inappropriate for cases [where] . . . statutes are justifiably attacked on their face as abridging free expression.” Dombrowski v. Pfister, 380 U. S. 479, 489-490 (1965). “In such case[s] to force the plaintiff who has commenced a federal ac[468]*468tion to suffer the delay of state-court proceedings might itself effect the impermissible chilling of the very constitutional right he seeks to protect.” Zwickler v. Koota, 389 U. S. 241, 252 (1967).
Even if this case did not involve a facial challenge under the First Amendment, we would find abstention inappropriate. In cases involving a facial challenge to a statute, the pivotal question in determining whether abstention is appropriate is whether the statute is “fairly subject to an interpretation which will render unnecessary or substantially modify the federal constitutional question.” Harman v. Forssenius, 380 U. S. 528, 534-535 (1965); see also Hawaii Housing Authority v. Midkiff, 467 U. S. 229, 236 (1984) (same). If the statute is not obviously susceptible of a limiting construction, then even if the statute has “never [been] interpreted by a state tribunal ... it is the duty of the federal court to exercise its properly invoked jurisdiction.” Harman, supra, at 535; see, e. g., Wisconsin v. Constantineau, 400 U. S. 433, 439 (1971) (“Where there is no ambiguity in the state statute, the federal court should not abstain but should proceed to decide the federal constitutional claim”); Zwickler v. Koota, supra, at 250-251, and n. 14 (citing cases).
This ordinance is not susceptible to a limiting construction because, as both courts below agreed, its language is plain and its meaning unambiguous. Its constitutionality cannot “turn upon a choice between one or several alternative meanings.” Baggett v. Bullitt, 377 U. S. 360, 378 (1964); cf. Babbitt v. Farm Workers, 442 U. S. 289, 308 (1979). Nor can the ordinance be limited by severing discrete unconstitutional subsections from the rest. For example, it cannot be limited to “core criminal conduct” such as physical assaults or fighting words because those applications are pre-empted by state law. See supra, at 460-461, and n. 10. The enforceable portion of this ordinance is a general prohibition of speech that “simply has no core” of constitutionally unprotected expression to which it might be limited. Smith v. [469]*469Goguen, 415 U. S., at 578 (emphasis deleted). The city’s proposed constructions are insufficient,18 and it is doubtful that even “a remarkable job of plastic surgery upon the face of the ordinance” could save it. Shuttlesworth v. Birmingham, 394 U. S. 147, 153 (1969). In sum, “[s]ince ‘the naked question, uncomplicated by [ambiguous language], is whether the Act on its face is unconstitutional,’ Wisconsin v. Constantineau, 400 U. S. 433, 439 (1971), abstention from federal jurisdiction is not required.” Hawaii Housing Authority, supra, at 237.
The city relies heavily on its claim that the state courts have not had an opportunity to construe the statute. Even if true, that factor would not in itself be controlling. As stated above, when a statute is not ambiguous, there is no need to abstain even if state courts have never interpreted the statute. Harman, supra, at 534. For example, we have declined to abstain from deciding a facial challenge to a state statute when the suit was filed in federal court just four days after the statute took effect. Brockett v. Spokane Arcades, Inc., 472 U. S. 491 (1985). But in any event, the city’s claim that state courts have not had an opportunity to construe the statute is misleading. Only the state appellate courts appear to have lacked this opportunity. It is undisputed that Houston’s Municipal Courts, which have been courts of [470]*470record in Texas since 1976, have had numerous opportunities to narrow the scope of the ordinance.19 There is no evidence that they have done so.20 In fact, the city’s primary position throughout this litigation has been “to insis[t] on the validity of the ordinance as literally read.” 789 F. 2d, at 1107. We have long recognized that trial court interpretations, such as those given in jury instructions, constitute “a ruling on a question of state law that is as binding on us as though the precise words had been written into the ordinance.” Terminiello, 337 U. S., at 4. Thus, where municipal courts have regularly applied an unambiguous statute, there is certainly no need for a federal court to abstain until state appellate courts have an opportunity to construe it.
The possibility of certification does not change our analysis.21 The certification procedure is useful in reducing the substantial burdens of cost and delay that abstention places on litigants. Where there is an uncertain question of state law that would affect the resolution of the federal claim, and where delay and expense are the chief drawbacks to abstention, the availability of certification becomes an important factor in deciding whether to abstain. E. g., Bellotti v. Baird, 428 U. S. 132 (1976). Nevertheless, even where we have recognized the importance of certification in deciding whether to abstain, we have been careful to note that the [471]*471availability of certification is not in itself sufficient to render abstention appropriate. Id., at 151. It would be manifestly inappropriate to certify a question in a case where, as here, there is no uncertain question of state law whose resolution might affect the pending federal claim. As we have demonstrated, supra, at 468-469, this ordinance is neither ambiguous nor obviously susceptible of a limiting construction.22 A federal court may not properly ask a state court if it would care in effect to rewrite a statute.23 We therefore see no need in this case to abstain pending certification.
> H-1
Today’s decision reflects the constitutional requirement that, in the face of verbal challenges to police action, officers and municipalities must respond with restraint. We are [472]*472mindful that the preservation of liberty depends in part upon the maintenance of social order. Cf. Terminiello v. Chicago, supra, at 37 (dissenting opinion). But the First Amendment recognizes, wisely we think, that a certain amount of expressive disorder not only is inevitable in a society committed to individual freedom, but must itself be protected if that freedom would survive. We therefore affirm the judgment of the Court of Appeals.
It is so ordered.
“ *The facts in this case, and particularly the direct conflict of testimony as to ‘who said what/ well illustrate the possibility of abuse.”