Task: sc_decisiondirection

What follows is an opinion from the Supreme Court of the United States. Your task is to determine the ideological "direction" of the decision ("liberal", "conservative", or "unspecifiable"). Use "unspecifiable" if the issue does not lend itself to a liberal or conservative description (e.g., a boundary dispute between two states, real property, wills and estates), or because no convention exists as to which is the liberal side and which is the conservative side (e.g., the legislative veto). Specification of the ideological direction comports with conventional usage. In the context of issues pertaining to criminal procedure, civil rights, First Amendment, due process, privacy, and attorneys, consider liberal to be pro-person accused or convicted of crime, or denied a jury trial, pro-civil liberties or civil rights claimant, especially those exercising less protected civil rights (e.g., homosexuality), pro-child or juvenile, pro-indigent pro-Indian, pro-affirmative action, pro-neutrality in establishment clause cases, pro-female in abortion, pro-underdog, anti-slavery, incorporation of foreign territories anti-government in the context of due process, except for takings clause cases where a pro-government, anti-owner vote is considered liberal except in criminal forfeiture cases or those where the taking is pro-business violation of due process by exercising jurisdiction over nonresident, pro-attorney or governmental official in non-liability cases, pro-accountability and/or anti-corruption in campaign spending pro-privacy vis-a-vis the 1st Amendment where the privacy invaded is that of mental incompetents, pro-disclosure in Freedom of Information Act issues except for employment and student records. In the context of issues pertaining to unions and economic activity, consider liberal to be pro-union except in union antitrust where liberal = pro-competition, pro-government, anti-business anti-employer, pro-competition, pro-injured person, pro-indigent, pro-small business vis-a-vis large business pro-state/anti-business in state tax cases, pro-debtor, pro-bankrupt, pro-Indian, pro-environmental protection, pro-economic underdog pro-consumer, pro-accountability in governmental corruption, pro-original grantee, purchaser, or occupant in state and territorial land claims anti-union member or employee vis-a-vis union, anti-union in union antitrust, anti-union in union or closed shop, pro-trial in arbitration. In the context of issues pertaining to judicial power, consider liberal to be pro-exercise of judicial power, pro-judicial "activism", pro-judicial review of administrative action. In the context of issues pertaining to federalism, consider liberal to be pro-federal power, pro-executive power in executive/congressional disputes, anti-state. In the context of issues pertaining to federal taxation, consider liberal to be pro-United States and conservative pro-taxpayer. In miscellaneous, consider conservative the incorporation of foreign territories and executive authority vis-a-vis congress or the states or judcial authority vis-a-vis state or federal legislative authority, and consider liberal legislative veto. In interstate relations and private law issues, consider unspecifiable in all cases.

Justice Ginsburg
delivered the opinion of the Court.
Petitioner Delma Banks, Jr., was convicted of capital murder and sentenced to death. Prior to trial, the State advised Banks’s attorney there would be no need to litigate discovery issues, representing: “[W]e will, without the necessity of motions[,] provide you with all discovery to which you are entitled.” App. 361, n. 1; App. to Pet. for Cert. A4 (both sources’ internal quotation marks omitted). Despite that undertaking, the State withheld evidence that would have allowed Banks to discredit two essential prosecution witnesses. The State did not disclose that one of those witnesses was a paid police informant, nor did it disclose a pretrial transcript revealing that the other witness’ trial testimony had been intensively coached by prosecutors and law enforcement officers.
Furthermore, the prosecution raised no red flag when the informant testified, untruthfully, that he never gave the police any statement and, indeed, had not talked to any police officer about the case until a few days before the trial. Instead of correcting the informant’s false statements, the prosecutor told the jury that the witness “ha[d] been open and honest with you in every way,” App. 140, and that his testimony was of the “utmost significance,” id., at 146. Similarly, the prosecution allowed the other key witness to convey, untruthfully, that his testimony' was entirely unrehearsed. Through direct appeal and state collateral review proceedings, the State continued to hold secret the key witnesses’ links to the police and allowed their false statements to stand uncorrected.
Ultimately, through discovery and an evidentiary hearing authorized in a federal habeas corpus proceeding, the long-suppressed evidence came to light. The District Court granted Banks relief from the death penalty, but the Court of Appeals reversed. In the latter court’s judgment, Banks had documented his claims of prosecutorial misconduct too late and in the wrong forum; therefore he did not qualify for federal-court relief. We reverse that judgment. When police or prosecutors conceal significant exculpatory or impeaching material in the State’s possession, it is ordinarily incumbent on the State to set the record straight.
I
On April 14, 1980, police found the corpse of 16-year-old Richard Whitehead in Pocket Park, east of Nash, Texas, a town in the vicinity of Texarkana. Id., at 8,141. A preliminary autopsy revealed that Whitehead had been shot three times. Id., at 10. Bowie County Deputy Sheriff Willie Huff, lead investigator of the death, learned from two witnesses that Whitehead had been in the company of petitioner, 21-year-old Delma Banks, Jr., late on the evening of April 11. Id., at 11-15,144; Banks v. State, 643 S. W. 2d 129, 131 (Tex. Crim. App. 1982) (en banc), cert. denied, 464 U. S. 904 (1983). On April 23, Huff received a call from a con-fidentiál informant reporting that “Banks was coming to Dallas to meet an individual and get a weapon.” App. 15. That evening, Huff and other officers followed Banks to South Dallas, where Banks visited a residence. Ibid.; Brief for Petitioner 3. Police stopped Banks’s vehicle en route from Dallas, found a handgun in the car, and arrested the car’s occupants. App. 16. Returning to the Dallas residence Banks had visited, Huff encountered and interviewed Charles Cook and recovered a second gun, a weapon Cook said Banks had left with him several days earlier. Ibid. Tests later identified the second gun as the Whitehead murder weapon. Id., at 17.
In a May 21,1980, pretrial hearing, Banks’s counsel sought information from Huff concerning the confidential informant who told Huff that Banks would be driving to Dallas. Id., at 21. Huff was unresponsive. Ibid. Any information that might reveal the identity of the informant, the prosecution urged, was privileged. Id., at 23. The trial court sustained the State’s objection. Id., at 24. Several weeks later, in a July 7, 1980, letter, the prosecution advised Banks’s counsel that “[the State] will, without necessity of motions provide you with all discovery to which you are entitled.” Id., at 361, n. 1; App. to Pet. for Cert. A4 (both sources’ internal quotation marks omitted).
The guilt phase of Banks’s trial spanned two days in September 1980. See Brief for Petitioner 2; App. to Pet. for Cert. C3. Witnesses testified to seeing Banks and Whitehead together on April 11 in Whitehead’s green Mustang, and to hearing gunshots in Pocket Park at 4 a.m. on April 12. Banks v. State, 643 S. W. 2d, at 131. Charles Cook testified that Banks arrived in Dallas in a green Mustang at about 8:15 a.m. on April 12, and stayed with Cook until April 14. App. 42-43,47-53. Cook gave the following account of Banks’s visit. On the morning of his arrival, Banks had blood on his leg and told Cook “he [had] got into it on the highway with a white boy.” Id., at 44. That night, Banks confessed to having “kill[ed] the white boy for the hell of it and take[n] his car and come to Dallas.”. Id., at 48. During their ensuing conversation, Cook first noticed that “[Banks] had a pistol.” Id., at 49. Two days later, Banks left Dallas by bus. Id., at 52-53. The next day, Cook abandoned the Mustang in West Dallas and sold Banks’s gun to a neighbor. Id., at 54. Cook further testified that, shortly before the police arrived at his residence to question him, Banks had revisited him and requested the gun. Id., at 57.
On cross-examination, Cook three times represented that he had not talked to anyone about his testimony. Id., at 59. In fact, however, Cook had at least one “pretrial practice sessio[n]” at which Huff and prosecutors intensively coached Cook for his appearance on the stand at Banks’s trial. Id., at 325, ¶ 10, 381-390; Joint Lodging Material 1-36 (transcript of pretrial preparatory session). The prosecution allowed Cook’s misstatements to stand uncorrected. In its guilt-phase summation, the prosecution told the jury “Cook brought you absolute truth.” App. 84.
In addition to Cook, Robert Farr was a key witness for the prosecution. Corroborating parts of Cook’s account, Farr testified to traveling to Dallas with Banks to retrieve Banks’s gun. Id., at 34-35. On cross-examination, defense counsel asked Farr whether he had “ever taken any money from some police officers,” or “give[n] any police officers a statement.” Id., at 37-38. Farr answered no to both questions; he asserted emphatically that police officers had not promised him anything and that he had “talked to no one about this [case]” until a few days before trial. Ibid. These answers were untrue, but the State did not correct them. Farr was the paid informant who told Deputy Sheriff Huff that Banks would travel to Dallas in search óf a gun. Id., at 329; App. to Pet. for Cert. A4, A9. In a 1999 affidavit, Farr explained:
“I assumed that if I did not help [Huff] with his investigation of Delma that he would have me arrested for drug charges. That’s why I agreed to help [Huff]. I was afraid that if I didn’t help him, I would be arrested.... “Willie Huff asked me to help him find Delma’s gun. I told [Huff] that he would have to pay me money right away for my help on the case. I think altogether he gave me about $200.00 for helping him. He paid me some of the money before I set Delma up. He paid me the rest after Delma was arrested and charged with murder....
“In order to help Willie Huff, I had to set Delma up. I told Delma that I wanted to rob a pharmacy to get drugs and that I needed his gun to do it. I did not really plan to commit a robbery but I told Delma this so that he would give me his gun.... I convinced Delma to drive to Dallas with me to get the gun.” App. 442-443, ¶ ¶ 6-8.
The defense presented no evidence. App. to Pet. for Cert. A6. Banks was convicted of murder committed in the course of a robbery, in violation of Tex. Penal Code Ann. § 19.03(a)(2) (1974). See App. to Pet. for Cert. C3.
The penalty phase ran its course the next day. Ibid. Governed by the Texas statutory capital murder scheme applicable in 1980, the jury decided Banks’s sentence by answering three “special issues.” App. 142-143. “If the jury unanimously answer[ed] ‘yes’ to each issue submitted, the trial court [would be obliged to] sentence the defendant to death.” Penry v. Lynaugh, 492 U. S. 302, 310 (1989) (construing Texas’ sentencing scheme); Tex. Code Crim. Proc. Ann., Arts. 37.071(c)-(e) (Vernon Supp. 1980). The critical question at the penalty phase in Banks’s case was: “Do you find from the evidence beyond a reasonable doubt that there is a probability that the defendant, Delma Banks, Jr., would commit criminal acts of violence that would constitute a continuing threat to society?” App. 143 (internal quotation marks omitted).
On this question, the State offered two witnesses, Vetrano Jefferson and Robert Farr. Id., at 104-113. Jefferson testified that, in early April 1980, Banks had struck him across the face with a gun and threatened to kill him. Id., at 104-106. Farr’s testimony focused once more on the trip to Dallas to fetch Banks’s gun. The gun was needed, Farr asserted, because “[w]e [Farr and Banks] were going to pull some robberies.” Id., at 108. According to Farr, Banks “said he would take care of it” if “there was any trouble during these burglaries.” Id., at 109. When the prosecution asked: “How did [Banks] say he would take care of it?” Farr responded: “[Banks] didn’t go into any specifics, but he said it would be taken care of.” Ibid.
On cross-examination, defense counsel twice asked whether Farr had told Deputy Sheriff Huff of the Dallas trip. Ibid. The State remained silent as Farr twice perjuriously testified: “No, I did not.” Ibid. Banks’s counsel also inquired whether Farr had previously attempted to obtain prescription drugs by fraud, and, “up tight over that,” would “testify to anything anybody want[ed] to hear.” Id., at 110. Farr first responded: “Can you prove it?” Ibid. Instructed by the court to answer defense counsel’s questions, Farr again said: “No, I did not....” Ibid.
Two defense witnesses impeached Farr, but were, in turn, impeached themselves. James Kelley testified to Farr’s attempts to obtain drugs by fraud; the prosecution impeached Kelley by eliciting his close relationship to Banks’s girlfriend. Id., at 124-129. Later,. Kelley admitted to being drunk while on the stand. App. to Pet. for Cert. A13. Former Arkansas police officer Gary Owen testified that Farr, as a police informant in Arkansas, had given false information; the prosecution impeached Owen by bringing out his pending application for employment by defense counsel’s private investigator. App. 129-131.
Banks’s parents and acquaintances testified that Banks was a “respectful, churchgoing young man.” App. to Pet. for Cert. A7; App. 137-139. Thereafter, Banks took the stand. He affirmed that he had “never before been convicted of a felony.” Id., at 134. Banks admitted striking Vetrano Jefferson in April 1980, and traveling to Dallas to obtain a gun in late April 1980. Id., at 134-136. He denied, however, any intent to participate in robberies, asserting that Farr alone had planned to commit them. Id., at 136-137. The prosecution suggested on cross-examination that Banks had been willing “to supply [Farr] the means and possible death weapon in an armed robbery case.” Id., at 137. Banks conceded as much. Ibid.
During summation, the prosecution intimated that Banks had not been wholly truthful in this regard, suggesting that “a man doesn’t travel two hundred miles, or whatever the distance is from here [Texarkana] to Dallas, Texas, to supply a person with a weapon.” Id., at 143. The State homed in on Farr’s testimony that Banks said he would “take care” of any trouble arising during the robbery:
“[Farr] said, ‘Man, you know, what i[f] there’s trouble?’ And [Banks] says, ‘Don’t worry about it. I’ll take care of it.’ I*think that speaks for itself, and I think you know what that means.... I submit to you beyond a reasonable doubt that the State has again met its burden of proof, and that the answer to question number two [propensity to commit violent criminal acts] should also be yes.” Id., at 140,144. See also id., at 146-147.
Urging Farr’s credibility, the prosecution called the jury’s attention to Farr’s admission, at. trial, that he used narcotics. Id., at 36, 140. Just as Farr had been truthful about his drug use, the prosecution suggested, he was also “open and honest with [the jury] in every way” in his penalty-phase testimony. Id., at 140. Farr’s testimony, the prosecution emphasized, was “of the utmost significance” because it showed “[Banks] is a danger to friends and strangers, alike.” Id., at 146. Banks’s effort to impeach Farr was ineffective, the prosecution further urged, because defense witness “Kelley kn[ew] nothing about the murder,” and defense witness Owen “wish[ed] to please his future employers.” Id., at 148.
The jury answered yes to the three special issues, and the judge sentenced Banks to death. The Texas Court of Criminal Appeals denied Banks’s direct appeal. 643 S. W. 2d, at 135. Banks’s first two state postconviction motions raised issues not implicated here; both were denied. Ex parte Banks, No. 13568-01 (Tex. Crim. App. 1984); Ex parte Banks, 769 S. W. 2d 539, 540 (Tex. Crim. App. 1989).
Banks’s third state postconviction motion, filed January 13, 1992, presented questions later advanced in federal court and reiterated in the petition now before us. App. 150. Banks alleged “upon information and belief” that “the prosecution knowingly failed to turn over exculpatory evidence as required by [Brady v. Maryland, 373 U. S. 83 “(1963)]”; the withheld evidence, Banks asserted, “would have revealed Robert Farr as a police informant and Mr. Banks’ arrest as a set-up.” App. 180, ¶ 114 (internal quotation marks omitted). In support of this third state-court postconviction plea, Banks attached an unsigned affidavit from his girlfriend, Farr’s sister-in-law Demetra Jefferson, which stated that Farr “was well-connected to law enforcement people,” and consequently managed to stay out of “trouble” for illegally obtaining prescription drugs. Id., at 195, ¶7. Banks alleged as well that during the guilt phase of his trial, the State deliberately withheld information “critical to the jury’s assessment of Cook’s credibility,” including the “generous ‘deal’ [Cook had] cut with the prosecutors.” Id., at 152, ¶ 2, 180, ¶ 114.
The State’s reply to Banks’s pleading, filed October 6,1992, “denie[d] each and every allegation of fact made by [Banks], except those supported by official court records and those specifically admitted.” Id., at 234; Tr. of Oral Arg, 32. “[N]othing was kept secret from the defense,” the State represented. App. 234. While the reply specifically asserted that the State had made “no deal with Cook,” ibid., the State said nothing specific about Farr. Affidavits from Deputy Sheriff Huff and prosecutors accompanied the reply. Id., at 241-243. The affiants denied any “deal, secret or otherwise, with Charles Cook,” but they, too, like the State’s pleading they supported, remained silent about Farr. Ibid.
In February and July 1993 orders, the state postconviction court rejected Banks’s claims. App. to Pet. for Cert. E1-E9, G1-G7. The court found that “there was no agreement between the State and the witness Charles Cook,” but made no findings concerning Farr. Id., at G2. In a January 10, 1996, one-page per curiam order, the Texas Court of Criminal Appeals upheld the lower court’s disposition of Banks’s motion. Id., at Dl.
On March 7, 1996, Banks filed the instant petition for a writ of habeas corpus in the United States District Court for the Eastern District of Texas. App. 248. He alleged multiple violations of his federal constitutional rights. App. to Pet. for Cert. C5-C7. Relevant here, Banks reasserted that the State had withheld material exculpatory evidence “reveal[ing] Robert Farr as a police informant and Mr. Banks’ arrest as a set-up.” App. 260, ¶ 152 (internal quotation marks omitted). Banks also asserted that the State had. concealed “Cook’s enormous incentive to testify in a manner favorable to the [prosecution].” Id., at 260, ¶ 153; App. to Pet. for Cert. C6-C7. In June 1998, Banks moved for discovery and an evidentiary hearing to gain information from the State on the roles played and trial testimony provided by Farr and Cook. App. 262-266, 282-283, 286. The superintending Magistrate Judge allowed limited discovery regarding Cook, but found insufficient justification for inquiries concerning Farr. Id., at 294-295.
Banks renewed his discovery and evidentiary requests in February 1999. Id., at 2, 300-331. This time, he proffered affidavits from both Farr and Cook to back up his claims that, as to each of these two key witnesses, the prosecution had wrongly withheld crucial exculpatory and impeaching evidence. Id., at 322-331. Farr’s affidavit affirmed that Farr had “set Delma up” by proposing the drive to Dallas and informing Deputy Sheriff Huff of the trip. Id., at 329, ¶ 8, 442-443, ¶ 8; supra, at 678. Accounting for his unavailability earlier, Farr stated that less than a year after the Banks trial, he had left Texarkana, first for Oklahoma, then for California, because his police-informant work endangered his life. App. 330-331, 444; Pet. for Cert. 27, n. 12. Cook recalled that in preparation for his Banks trial testimony, he had participated in “three or four... practice sessions” at which prosecutors told him to testify “as they wanted [him] to, and that [he] would spend the rest of [his] life in prison if [he] did not.” App. 325, ¶¶ 10-11.
On March 4, 1999, the Magistrate Judge an establishing issues for an evidentiary hearing, id., at 340, 346, at which she would consider Banks’s claims that the State had withheld “crucial exculpatory and impeaching evidence” concerning “two of the [S]tate’s essential witnesses, Charles Cook and Robert Farr,” id., at 340, 345 (internal quotation marks omitted). In anticipation of the hearing, the Magistrate Judge ordered disclosure of the Bowie County District Attorney’s files. Brief for Petitioner 37-38; Tr. of June 7-8, 1999, Federal Evidentiary Hearing (ED Tex.), p. 30 (hereinafter Federal Evidentiary Hearing).
One item lodged in the District Attorney’s files, turned over to Banks pursuant to the Magistrate Judge’s disclosure order, was a 74-page transcript of a Cook interrogation. App. to Pet. for Cert. A10. The interrogation, conducted by Bowie County law enforcement officials and prosecutors, occurred in September 1980, shortly before the Banks trial. Ibid. The transcript revealed that the State’s representatives had closely rehearsed Cook’s testimony. In particular, the officials told Cook how to reconcile his testimony with affidavits to which he had earlier subscribed recounting Banks’s visits to Dallas. See, e. g., Joint Lodging Material 24 (“Your [April 1980] statement is obviously screwed up.”); id., at 26 (“[T]he way this statement should read is that....”); id., at 32 (“[Ljet me tell you how this is going to work.”); id., at 36 (“That’s not in your [earlier] statement.”). Although the transcript did not bear on Banks’s claim that the prosecution had a deal with Cook, it provided compelling evidence that Cook’s testimony had been tutored by Banks’s prosecutors. Without objection at the hearing, the Magistrate Judge admitted the September 1980 transcript into evidence. Brief for Petitioner 39; Federal Evidentiary Hearing 75-76.
Testifying at the evidentiary hearing, Deputy Sheriff Huff acknowledged, for the first time, that Farr was an informant and that he had been paid $200 for his involvement in the case. App. to Pet. for Cert. C43. As to Cook, a Banks trial prosecutor testified, in line with the State’s consistent position, that no deal had been offered to gain Cook’s trial testimony. Id., at C45; Federal Evidentiary Hearing 52-53. Defense counsel questioned the prosecutor about the September 1980 transcript, calling attention to discrepancies between the transcript and Cook’s statements at trial. Id., at 65-68. In a posthearing brief and again in proposed findings of fact and conclusions of law, Banks emphasized the suppression of the September 1980 transcript, noting the prosecution’s obligation to disclose material, exculpatory evi-. dence, and the assurance in this case that Banks would receive “all [the] discovery to which [Banks was] entitled.” App. 360-361, and n. 1, 378-379 (internal quotation marks omitted); supra, at 677.
In a May 11,2000, report and recommendation, the Magistrate Judge recommended a writ of habeas corpus with respect to Banks’s death sentence, but not his conviction. App. to Pet. for Cert. C54. “[T]he State’s failure to disclose Farr’s informant status, coupled with trial counsel’s dismal performance during the punishment phase,” the Magistrate Judge concluded, “undermined the reliability of the jury’s verdict regarding punishment.” Id., at C44. Finding no convincing evidence of a deal between the State and Cook, however, she recommended that the guilt-phase verdict remain undisturbed. Id., at C46.
Banks moved to alter or amend the Magistrate Judge’s report on the ground that it left unresolved a fully aired question, i e., whether Banks’s rights were violated by the State’s failure to disclose to the defense the prosecution’s eve-of-trial interrogation of Cook. App. 398. That interrogation, Banks observed, could not be reconciled with Cook’s insistence at trial that he had talked to no one about his testimony. Id., at 400, n. 17; see supra, at 677.
The District Court adopted the Magistrate Judge’s report and denied Banks’s motion to amend the report. App. to Pet. for Cert. B6; App. 421-424. Concerning the Cook Brady transcript-suppression claim, the District Court recognized that Banks had filed his federal petition in 1996, three years before he became aware of the September 1980 transcript. App. 422-423. When the transcript surfaced in response to the Magistrate Judge’s 1999 disclosure order, Banks raised that newly discovered, long withheld document in his proposed findings of fact and conclusions of law and, again, in his objections to the Magistrate Judge’s report. Id., at 423. The District Court concluded, however, that Banks had not properly pleaded a Brady claim predicated on the withheld Cook rehearsal transcript. App. 422. When that Brady claim came to light, the District Court reasoned, Banks should have moved to amend or supplement his 1996 federal habeas petition specifically to include the 1999 discovery as a basis for relief. App. 423. Banks urged that a Brady claim based on the September 1980 transcript had been aired by implied consent; under Federal Rule of Civil Procedure 15(b), he contended, the claim should have been treated as if raised in the pleadings. App. 433. Banks sought, and the District Court denied, a certificate of appeal-ability on this question. Id., at 433, 436.
In an August 20, 2003, unpublished per curiam opinion, the Court of Appeals for the Fifth Circuit reversed the judgment of the District Court to the extent that it granted relief on the Farr Brady claim and denied a certificate of appeal-ability on the Cook Brady claim. App. to Pet. for Cert. A2, judgt. order reported at 48 Fed. Appx. 104 (2002). The Court of Appeals observed that in his 1992 state-court post-conviction application, Banks had not endeavored to develop the facts underpinning the Farr Brady claim. App. to Pet. for Cert. A19-A20. For that reason, the court held, the evi-dentiary proceeding ordered by the Magistrate Judge was unwarranted. Ibid. The Court of Appeals expressed no doubt that the prosecution had suppressed, prior to the federal habeas proceeding, Farr’s informant status and his part in the fateful trip to Dallas. But Banks was not appropriately diligent in pursuing his state-court application, the Court of Appeals maintained. In the Fifth Circuit’s view, Banks should have at that time attempted to locate Farr and question him; similarly, he should have asked to interview Deputy Sheriff Huff and other officers involved in investigating the crime. Id., at A19, A22. If such efforts had proved unavailing, the Court of Appeals suggested, Banks might have applied to the state court for assistance. Id., at A19. Banks’s lack of diligence in pursuing his 1992 state-court plea, the Court of Appeals concluded, rendered the evidence uncovered in the federal habeas proceeding procedurally barred. Id., at A22-A23.
In any event, the Fifth Circuit further concluded, Farr’s status as an informant was not “materia[l]” for Brady purposes. App. to Pet. for Cert. A32-A33. Banks had impeached Farr at trial by bringing out that he had been a police informant in Arkansas, and an unreliable one at that. Id., at A28, A32-A33; supra, at 680. Moreover, the Court of Appeals said, other witnesses had corroborated much of Farr’s testimony against Banks. App. to Pet. for Cert. A32. Notably, Banks himself had acknowledged his willingness to get a gun for Farr’s use in robberies. Ibid. In addition, the Fifth Circuit observed, the Magistrate Judge had relied on the cumulative effect of Brady error and the ineffectiveness of Banks’s counsel at the penalty phase. App. to Pet. for Cert. A44. Banks himself, however, had not urged that position; he had argued Brady and ineffective assistance of counsel discretely, not cumulatively. App. to Pet. for Cert. A46-A47. Finally, in accord with the District Court, the Court of Appeals apparently regarded Rule 15(b) as inapplicable in habeas proceedings. App. to Pet. for Cert. A51-A52. The Fifth Circuit accordingly denied a certificate of appealability on the Cook Brady transcript-suppression claim. App. to Pet. for Cert. A52, A78.
With an execution date set for March 12, 2003, Banks applied to this Court for a writ of certiorari, presenting four issues: the tenability of his Farr Brady claim; a penalty-phase ineffective-assistance-of-counsel claim; the question whether, as to the Cook Brady transcript-suppression claim, a certificate of appealability was wrongly denied; and a claim of improper exclusion of minority jurors in violation of Swain v. Alabama, 380 U. S. 202 (1965). Pet. for Cert. 23-24. We stayed Banks’s execution on March 12, 2003, 538 U. S. 917, and, on April 21, 2003, granted his petition on all questions other than his Swain claim. 538 U. S. 977. We now reverse the Court of Appeals’ judgment dismissing Banks’s Farr Brady claim and that Court’s denial of a certificate of appealability on his Cook Brady claim.
II
We note, initially, that Banks s Brady claims arose under the regime in place prior to the Antiterrorism and Effective Death Penalty Act of 1996 (AEDPA), 110 Stat. 1214. Turning to the tenability of those claims, we consider first Banks’s Farr Brady claim as it trains on his death sentence, see App. to Pet. for Cert. B6 (District Court granted habeas solely with respect to the capital sentence), and next, Banks’s Cook Brady claim.
A
To pursue habeas corpus relief in federal court, Banks first had to exhaust “the remedies available in the courts of the State;” 28 U. S. C. §2254(b) (1994 ed.); see Rose v. Lundy, 455 U. S. 509, 520 (1982). Banks alleged in his January 1992 state-court application for a writ of habeas corpus that the prosecution knowingly failed to turn over exculpatory evidence involving Farr in violation of Banks’s due process rights. App. 180. Banks thus satisfied the exhaustion requirement as to the legal ground for his Farr Brady claim.
In state postconviction court, however, Banks failed to produce evidence establishing that Farr had served as a police informant in this case. As support for his Farr Brady claim, Banks appended to his state-court application only De-metra Jefferson’s hardly probative statement that Farr “was well-connected to law enforcement people.” App. 195, ¶ 7; see supra, at 682. In the federal habeas forum, therefore, it was incumbent on Banks to show that he was not barred, by reason of the anterior state proceedings, from producing evidence to substantiate his Farr Brady claim. Banks “[would be] entitled to an evidentiary hearing [in federal court] if he [could] show cause for his failure to develop the facts in state-court proceedings and actual prejudice resulting from that failure.” Keeney v. Tamayo-Reyes, 504 U. S. 1, 11 (1992).
Brady, we reiterate, held that “the suppression by the prosecution of evidence favorable to an accused upon request violates due process where the evidence is material either to guilt or to punishment, irrespective of the good faith or bad faith of the prosecution.” 373 U. S., at 87. We set out in Strickler v. Greene, 527 U. S. 263, 281-282 (1999), the three components or essential elements of a Brady prosecutorial misconduct claim: “The evidence at issue must be favorable to the accused, either because it is exculpatory, or because it is impeaching; that evidence must have been suppressed by the State, either willfully or inadvertently; and prejudice must have ensued.” 527 U. S., at 281-282. “[Clause and prejudice” in this case “parallel two of the three components of the alleged Brady violation itself.” Id., at 282. Corresponding to the second Brady component (evidence suppressed by the State), a petitioner shows “cause” when the reason for his failure to develop facts in state-court proceedings was the State’s suppression of the relevant evidence; coincident with the third Brady component (prejudice), prejudice within the compass of the “cause and prejudice” requirement exists when the suppressed evidence is “material” for Brady purposes. 527 U. S., at 282. As to the first Brady component (evidence favorable to the accused), beyond genuine debate, the suppressed evidence relevant here, Farr’s paid informant status, qualifies as evidence advantageous to Banks. See App. to Pet. for Cert. A26 (Court of Appeals’ recognition that “Farr’s being a paid informant would certainly be favorable to Banks in attacking Farr’s testimony”). Thus, if Banks succeeds in demonstrating “cause and prejudice,” he will at the same time succeed in establishing the elements of his Farr Brady death penalty due process claim.
B
Our determination as to “cause” for Banks’s failure to develop the facts in state-court proceedings is informed by Strickler: In that case, Virginia prosecutors told the petitioner, prior to trial, that “the prosecutor’s files were open to the petitioner’s counsel,” thus “there was no need for a formal [Brkdy] motion.” 527 U. S., at 276, n. 14 (quoting App. in Strickler v. Greene, O. T. 1998, No. 98-5864, pp. 212-213 (brackets in original)). The prosecution file given to the Strickler petitioner, however, did not include several documents prepared by an “importan[t]” prosecution witness, recounting the witness’ initial difficulty recalling the events to which she testified at the petitioner’s trial. 527 U. S., at 273-275, 290. Those absent-from-the-file documents could have been used to impeach the witness. Id., at 273. In state-court postconviction proceedings, the Strickler petitioner had unsuccessfully urged ineffective assistance of trial counsel based on counsel’s failure to move, pretrial, for Brady material. Answering that plea, the State asserted that a Brady motion would have been superfluous, for the prosecution had maintained an open file policy pursuant to which it had disclosed all Brady material. 527 U. S., at 276, n. 14, 278.
This Court determined that in the federal habeas proceedings, the Strickler petitioner had shown cause for his failure to raise a Brady claim in state court. 527

Question: What is the ideological direction of the decision?
A. Conservative
B. Liberal
C. Unspeciﬁable
Answer:

Answer: B