From Ashcroft v. Iqbal, No. 07-1015, 2009 U.S. LEXIS 3472 (U.S. May 18, 2009):

Under Federal Rule of Civil Procedure 8(a)(2), a pleading must contain a "short and plain statement of the claim showing that the pleader is entitled to relief." As the Court held in Twombly, 550 U.S. 544, the pleading standard Rule 8 announces does not require "detailed factual allegations," but it demands more than an unadorned, the-defendant-unlawfully-harmed-me accusation. Id., at 555 (citing Papasan v. Allain, 478 U.S. 265, 286 (1986)). A pleading that offers "labels and conclusions" or "a formulaic recitation of the elements of a cause of action will not do." U.S., at 555. Nor does a complaint suffice if it tenders "naked assertion[s]" devoid of "further factual enhancement." Id., at 557.

To survive a motion to dismiss, a complaint must contain sufficient factual matter, accepted as true, to "state a claim to relief that is plausible on its face." Id., at 570. A claim has facial plausibility when the plaintiff pleads factual content that allows the court to draw the reasonable inference that the defendant is liable for the misconduct alleged. Id., at 556. The plausibility standard is not akin to a "probability requirement," but it asks for more than a sheer possibility that a defendant has acted unlawfully. Ibid. Where a complaint pleads facts that are "merely consistent with" a defendant's liability, it "stops short of the line between possibility and plausibility of 'entitlement to relief.'" Id., at 557 (brackets omitted).

Two working principles underlie our decision in Twombly. First, the tenet that a court must accept as true all of the allegations contained in a complaint is inapplicable to legal conclusions. Threadbare recitals of the elements of a cause of action, supported by mere conclusory statements, do not suffice. Id., at 555 (Although for the purposes of a motion to dismiss we must take all of the factual allegations in the complaint as true, we "are not bound to accept as true a legal conclusion couched as a factual allegation" (internal quotation marks omitted)). Rule 8 marks a notable and generous departure from the hyper-technical, code-pleading regime of a prior era, but it does not unlock the doors of discovery for a plaintiff armed with nothing more than conclusions. Second, only a complaint that states a plausible claim for relief survives a motion to dismiss. Id., at 556. Determining whether a complaint states a plausible claim for relief will, as the Court of Appeals observed, be a context-specific task that requires the reviewing court to draw on its judicial experience and common sense. 490 F.3d at 157-158. But where the well-pleaded facts do not permit the court to infer more than the mere possibility of misconduct, the complaint has alleged — but it has not "show[n]" — "that the pleader is entitled to relief." Fed. Rule Civ. Proc. 8(a)(2).

In keeping with these principles a court considering a motion to dismiss can choose to begin by identifying pleadings that, because they are no more than conclusions, are not entitled to the assumption of truth. While legal conclusions can provide the framework of a complaint, they must be supported by factual allegations. When there are well-pleaded factual allegations, a court should assume their veracity and then determine whether they plausibly give rise to an entitlement to relief.

Our decision in Twombly illustrates the two-pronged approach. There, we considered the sufficiency of a complaint alleging that incumbent telecommunications providers had entered an agreement not to compete and to forestall competitive entry, in violation of the Sherman Act, 15 U.S.C. §1. Recognizing that §1 enjoins only anticompetitive conduct "effected by a contract, combination, or conspiracy," … the plaintiffs in Twombly flatly pleaded that the defendants "ha[d] entered into a contract, combination or conspiracy to prevent competitive entry ... and ha[d] agreed not to compete with one another." 550 U.S., at 551 (internal quotation marks omitted). The complaint also alleged that the defendants' "parallel course of conduct ... to prevent competition" and inflate prices was indicative of the unlawful agreement alleged. Ibid. (internal quotation marks omitted).

The Court held the plaintiffs' complaint deficient under Rule 8. In doing so it first noted that the plaintiffs' assertion of an unlawful agreement was a "'legal conclusion'" and, as such, was not entitled to the assumption of truth. Id., at 555. Had the Court simply credited the allegation of a conspiracy, the plaintiffs would have stated a claim for relief and been entitled to proceed perforce. The Court next addressed the "nub" of the plaintiffs' complaint — the well-pleaded, nonconclusory factual allegation of parallel behavior — to determine whether it gave rise to a "plausible suggestion of conspiracy." Id., at 565-566. Acknowledging that parallel conduct was consistent with an unlawful agreement, the Court nevertheless concluded that it did not plausibly suggest an illicit accord because it was not only compatible with, but indeed was more likely explained by, lawful, unchoreographed free-market behavior. Id., at 567. Because the well-pleaded fact of parallel conduct, accepted as true, did not plausibly suggest an unlawful agreement, the Court held the plaintiffs' complaint must be dismissed. Id., at 570.

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Under Twombly's construction of Rule 8, we conclude that respondent's complaint has not "nudged [his] claims" of invidious discrimination "across the line from conceivable to plausible." Ibid.

We begin our analysis by identifying the allegations in the complaint that are not entitled to the assumption of truth. Respondent pleads that petitioners "knew of, condoned, and willfully and maliciously agreed to subject [him]" to harsh conditions of confinement "as a matter of policy, solely on account of [his] religion, race, and/or national origin and for no legitimate penological interest." ... The complaint alleges that Ashcroft was the "principal architect" of this invidious policy…, and that Mueller was "instrumental" in adopting and executing it…. These bare assertions, much like the pleading of conspiracy in Twombly, amount to nothing more than a "formulaic recitation of the elements" of a constitutional discrimination claim, 550 U.S., at 555, namely, that petitioners adopted a policy "'because of,' not merely 'in spite of,' its adverse effects upon an identifiable group." Feeney, 442 U.S., at 279. As such, the allegations are conclusory and not entitled to be assumed true. Twombly, supra, 550 U.S., at 554-555. To be clear, we do not reject these bald allegations on the ground that they are unrealistic or nonsensical. We do not so characterize them any more than the Court in Twombly rejected the plaintiffs' express allegation of a "'contract, combination or conspiracy to prevent competitive entry,'" id., at 551, because it thought that claim too chimerical to be maintained. It is the conclusory nature of respondent's allegations, rather than their extravagantly fanciful nature, that disentitles them to the presumption of truth.

We next consider the factual allegations in respondent's complaint to determine if they plausibly suggest an entitlement to relief. The complaint alleges that "the [FBI], under the direction of Defendant MUELLER, arrested and detained thousands of Arab Muslim men . . . as part of its investigation of the events of September 11." ... It further claims that "[t]he policy of holding post-September-11th detainees in highly restrictive conditions of confinement until they were 'cleared' by the FBI was approved by Defendants ASHCROFT and MUELLER in discussions [*35] in the weeks after September 11, 2001." ... Taken as true, these allegations are consistent with petitioners' purposefully designating detainees "of high interest" because of their race, religion, or national origin. But given more likely explanations, they do not plausibly establish this purpose.

The September 11 attacks were perpetrated by 19 Arab Muslim hijackers who counted themselves members in good standing of al Qaeda, an Islamic fundamentalist group. Al Qaeda was headed by another Arab Muslim — Osama bin Laden — and composed in large part of his Arab Muslim disciples. It should come as no surprise that a legitimate policy directing law enforcement to arrest and detain individuals because of their suspected link to the attacks would produce a disparate, incidental impact on Arab Muslims, even though the purpose of the policy was to target neither Arabs nor Muslims. On the facts respondent alleges the arrests Mueller oversaw were likely lawful and justified by his nondiscriminatory intent to detain aliens who were illegally present in the United States and who had potential connections to those who committed terrorist acts. As between that "obvious alternative explanation" for the arrests, Twombly, supra, at 567, and the purposeful, invidious discrimination respondent asks us to infer, discrimination is not a plausible conclusion.

But even if the complaint's well-pleaded facts give rise to a plausible inference that respondent's arrest was the result of unconstitutional discrimination, that inference alone would not entitle respondent to relief…. Respondent's constitutional claims against petitioners rest solely on their ostensible "policy of holding post-September-11th detainees" in the ADMAX SHU once they were categorized as "of high interest." ... To prevail on that theory, the complaint must contain facts plausibly showing that petitioners purposefully adopted a policy of classifying post-September-11 detainees as "of high interest" because of their race, religion, or national origin.

This the complaint fails to do. Though respondent alleges that various other defendants, who are not before us, may have labeled him a person of "of high interest" for impermissible reasons, his only factual allegation against petitioners accuses them of adopting a policy approving "restrictive conditions of confinement" for post-September-11 detainees until they were "'cleared' by the FBI." ... Accepting the truth of that allegation, the complaint does not show, or even intimate, that petitioners purposefully housed detainees in the ADMAX SHU due to their race, religion, or national origin. All it plausibly suggests is that the Nation's top law enforcement officers, in the aftermath of a devastating terrorist attack, sought to keep suspected terrorists in the most secure conditions available until the suspects could be cleared of terrorist activity. Respondent does not argue, nor can he, that such a motive would violate petitioners' constitutional obligations. He would need to allege more by way of factual content to "nudg[e]" his claim of purposeful discrimination "across the line from conceivable to plausible." Twombly, 550 U.S., at 570.

To be sure, respondent can attempt to draw certain contrasts between the pleadings the Court considered in Twombly and the pleadings at issue here. In Twombly, the complaint alleged general wrongdoing that extended over a period of years, id., at 551, whereas here the complaint alleges discrete wrongs — for instance, beatings — by lower level Government actors. The allegations here, if true, and if condoned by petitioners, could be the basis for some inference of wrongful intent on petitioners' part. Despite these distinctions, respondent's pleadings do not suffice to state a claim. Unlike in Twombly, where the doctrine of respondeat superior could bind the corporate defendant, here, as we have noted, petitioners cannot be held liable unless they themselves acted on account of a constitutionally protected characteristic. Yet respondent's complaint does not contain any factual allegation sufficient to plausibly suggest petitioners' discriminatory state of mind. His pleadings thus do not meet the standard necessary to comply with Rule 8.