Appellant Harvey Russell Wright, Jr. pleaded guilty to distributing cocaine in violation of 21 U.S.C. § 841(a)(1). He was sentenced to two years in the custody of the Attorney General and a three-year special parole term. After his release from prison but before his parole term had expired, appellant filed a petition for Writ of Error Corum Nobis with the United States District Court for the Western District of Oklahoma. In his petition, appellant claimed that the prosecution (1) breached its informal immunity agreement with appellant, (2) withheld requested material evidence, and (3) coerced appellant’s guilty plea by threatening to indict members of his family. The district court denied appellant’s petition, and he now appeals. We exercise jurisdiction pursuant to 28 U.S.C. § 2255 and affirm in part and remand in part.
I. Background
On April 13, 1987, a federal grand jury returned a twenty-six count indictment against defendant, each count involving the possession or distribution of cocaine or marijuana. On April 21, 1987, appellant filed several motions, including a Motion to Dismiss the Indictment (“motion to dismiss”) and a Motion and Memorandum for Disclosure of Impeaching Information (“motion for disclosure”). The motion to dismiss alleged that the government had violated the informal immunity agreement it had reached with appellant. According to appellant, prosecutors assured him in their agreement that he was not “nor would he become the subject of an investigation so long as he did not lie or commit perjury before the grand jury.” The disclosure motion requested specific information, including the disclosure of “[a]ny and all consideration or promises of consideration given to or on behalf of the witness or expected or hoped for by the witness.”
By written order dated May 13, 1987, the district court granted appellant’s motion for disclosure and directed the government to provide the defense with the requested information twenty days prior to trial. One week later, the district court denied appellant’s motion to dismiss; appellant immediately appealed this ruling.
On the morning his trial was to begin, appellant reached a plea agreement with the prosecution. Appellant agreed to plead guilty to one count of distributing cocaine and to dismiss his appeal from the district court’s denial of his motion to dismiss the indictment. In exchange, the government dismissed the other twenty-five counts included in the indictment. After accepting his plea, the court sentenced appellant to two years in the custody of the Attorney General and a three-year special parole term.
After his release from prison, appellant discovered that, contrary to the evidence disclosed by the prosecution prior to trial, the government had reached informal immunity agreements with several of its witnesses against appellant. According to appellant, each of these agreements was nearly identical to the agreement appellant thought he had reached with the prosecution. Upon re *494 lease of his complete government file, appellant also discovered that the government never had sufficient evidence to indict any members of his family.
On August 30, 1990, appellant filed a petition for Writ of Error Corum Nobis with the district court. His petition contained three claims. First, he asserted that the prosecution violated its agreement not to prosecute appellant if he testified before the grand jury. Appellant claimed that he divulged self-incriminating evidence before the grand jury only after receiving assurances from Assistant United States Attorney Watson (“AUSA Watson”) that he was not the target of a government investigation and that he would not be prosecuted. Second, he claimed that the prosecution withheld requested evidence of similar informal immunity agreements it had reached with several witnesses. Finally, he claimed that the prosecution had coerced him into pleading guilty by threatening to indict several members of his family on mail fraud charges.
Because appellant was still in government custody as a parolee, the court treated his petition as a request for relief pursuant to 28 U.S.C. § 2255. The government moved to dismiss appellant’s petition on summary judgment, but the court denied the government’s motion and held a three-day eviden-tiary hearing.
By written order ’dated September 16, 1992, the district court denied appellant’s petition. The court held that appellant’s first two claims were procedurally barred due to his failure to raise them on direct appeal. With respect to appellant’s third claim, the court found that the prosecution had investigated the members of appellant’s family in good faith. Thus, even if the prosecution had made the threats alleged in appellant’s petition, it had not violated appellant’s right to due process. Appellant now appeals the district court’s order.
II. Violation of Appellant’s Non-Prosecution Agreement
Appellant first claims that the prosecution denied him due process by breaching an informal immunity agreement used to induce appellant to testify at two grand jury proceedings. A defendant who knowingly and voluntarily pleads guilty
1
waives all non-jurisdictional challenges to his conviction.
United States v. Gines,
In this case, appellant was fully cognizant of the alleged governmental misconduct when he entered his plea. Instead of pursuing these claims further, he decided to accept the prosecution’s plea bargain. By doing so, appellant waived any claim that the government breached its non-prosecution agreement with him. While appellant’s allegations, if true, demonstrate troublesome conduct by the prosecution, they do not call into question the knowing and voluntary nature of his plea. Appellant is therefore barred from raising such a claim in his section 2255 petition.
III. Failure to Disclose Non-Prosecution Agreements
Appellant next claims that the government violated his right to due process by withholding evidence of informal immunity agreements it had reached with several of its witnesses. Appellant asserts that, in his motion to disclose, he specifically requested the disclosure of all such agreements the prosecution reached with its witnesses. Moreover, the district court ordered the prosecution to disclose the requested information twenty days before trial. Appellant claims that, by suppressing this evidence, the prosecution denied him due process under the standards of
Brady v. Maryland,
A.
Again, a defendant who has pleaded guilty may thereafter only challenge the voluntariness of his plea.
United States v. Broce,
In
Brady,
the Supreme Court 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 punishment.”
This court has yet to address whether a defendant who has pleaded guilty can raise a
Brady
or
Giglio
claim in his section 2255 petition. The central question is whether the withholding of material evidence could taint a criminal proceeding so substantially that the defendant’s decision to plead guilty could not fairly be called knowing and intelligent. Most courts have held that defendants who have pleaded guilty are not barred from raising
Brady
claims in their petitions for post-conviction relief.
See, e.g., White v. United States,
The Supreme Court has often reiterated that a defendant’s guilty plea must be knowing and intelligent to be a constitutional basis for conviction. As the Court stated in
Brady v. United States,
is more than an admission of past conduct; it is the defendant’s consent that judgment of conviction may be entered without a trial — a waiver of his right to trial before a jury or judge. Waivers of constitutional rights not only must be voluntary but must be knowing, intelligent acts done with sufficient awareness of the relevant circumstances and likely consequences.
Id.
at 748,
In light of these decisions, as well as the importance to the integrity of our criminal justice system that guilty pleas be knowing and intelligent, we hold that, under certain limited circumstances, the prosecution’s violation of Brady can render a defendant’s plea involuntary. As the court stated in Fambo,
[wjithout [the clearly exculpatory] evidence before it, the trial court which accepted the plea could not, in fact, satisfy itself in any meaningful sense that petitioner’s guilty plea was voluntarily and intelligently made by an informed defendant with adequate advice of counsel, and that there was nothing to question the accuracy and reliability of this defendant’s admission that he had committed the crime with which he had been charged.
B.
A defendant is procedurally barred from presenting any claim in a section 2255 petition that he failed to raise on direct appeal unless he can demonstrate cause for his procedural default and prejudice suffered thereby, or that the failure to hear his claim would result in a fundamental miscarriage of justice.
2
United States v. Warner,
The duties imposed by
Brady
and
Giglio
do not require a prosecutor “to deliver his entire file to defense counsel, but only to disclose evidence favorable to the accused that, if suppressed, would deprive the defendant of a fair trial.”
Bagley,
Appellant claims that, had the prosecution disclosed the evidence of its pocket immunity agreements, he would have established “[AUSA] Watson’s
pattern
of threatening reluctant witnesses with criminal prosecution while simultaneously promising pocket immunity.” Appellant contends that, if he had established this pattern, the district court would have upheld his motion to dismiss the indictment. Thus, to determine whether the allegedly suppressed evidence is material for purposes of
Brady
and
Giglio,
*497
we must decide whether it is reasonably probable that the proceeding’s result — the district court’s denial of appellant’s motion to dismiss — would have been different had the prosecution properly disclosed the evidence requested by appellant. After carefully reviewing the district court’s decision to deny appellant’s motion to dismiss, we find that it is not reasonably probable that, had the allegedly suppressed evidence been presented to the district court, the court would have ruled differently. In its order, the district court properly stated that an indictment may be dismissed for prosecutorial misconduct only where such misconduct “is flagrant to the point that there is some significant infringement on a grand jury’s ability to exercise independent judgment.”
See United States v. Pino,
Appellant argues in this petition that, had the prosecution disclosed all of its informal immunity agreements, he could have proven that the prosecution had reached (and then breached) a similar agreement with him. The district court’s order denying appellant’s motion to dismiss makes clear, however, that the existence of such an agreement was irrelevant to its decision. The alleged agreement could not have “significant[ly] infringe[d] on [the] grand jury’s ability to exercise independent judgment” because appellant’s indictment was based on evidence other than his disputed grand jury testimony.
Because appellant would have used the allegedly suppressed evidence to establish that the government had violated its non-prosecution agreement with appellant, and the existence of such an agreement was irrelevant to the district court’s denial of appellant’s motion, the disputed evidence was not “material either to guilt or to punishment” for purposes of Brady and Giglio. Consequently, the prosecution’s failure to disclose any informal immunity agreements it had with its witnesses did not violate appellant’s right to due process.
IV. Threats to Indict Appellant’s Family Members
Finally, appellant claims that the prosecution coerced him into pleading guilty by threatening to indict members of his family. According to appellant, on the morning his trial was to begin, the government threatened to indict several members of his family if he did not agree to plead guilty. 3 Appellant contends that, although he knew his family members were innocent when the prosecution made the threats, he did not learn that the government lacked sufficient evidence with which to indict them until after he had been released from prison.
At his sentencing hearing, appellant testified that his guilty plea was knowing and voluntary, that the government had made no promises in exchange for his plea, and that he had not been coerced or threatened. A defendant who “has made an affirmation of voluntariness and has pled guilty ... carries a heavy burden” in subsequently claiming that his plea was involuntary.
United States v. Whalen,
Appellant may nonetheless be barred from seeking post-conviction relief pursuant to section 2255 due to his failure to
*498
raise this claim at any point previously. As discussed above, to raise a claim for the first time in a section 2255 petition, a defendant must demonstrate either cause and prejudice or a fundamental miscarriage of justice.
Warner,
The District of Columbia Circuit addressed a similar claim in
United States v. Pollard,
The Pollard court held that the defendant was not barred from raising his claim for the first time on collateral attack. Id. at 1019. If the defendant had been coerced into accepting his plea to protect his wife, “he could not be expected to openly challenge that very arrangement as unlawful while his wife was still vulnerable.” Id. In other words, the coercion that formed the basis of his claim “deterred [him] from raising that argument until his wife was out of harm’s way.” Id.
We find the reasoning of Pollard persuasive. Where the coercive threat still exists at the time the defendant was supposed to file his direct appeal, he has cause to claim on collateral attack that his plea was involuntary. To hold otherwise would force defendants to choose between jeopardizing the persons they are attempting to protect and waiving their claims of unlawful coercion. In this case, the district court did not make factual findings as to (1) whether the prosecution actually communicated the alleged threats, and (2) if so, whether the threats caused appellant to plead guilty. If appellant establishes these facts, he has cause for having failed to raise his claim on direct appeal.
To show prejudice, appellant must demonstrate that he “was denied ‘fundamental fairness,’ ”
Murray v. Carrier,
This court has held that government threats to prosecute third persons during plea negotiations are not necessarily unconstitutional.
See Mosier v. Murphy,
*499
This court has yet to define what practical requirements this “high standard of good faith” imposes on prosecutors. Most courts have held that, to act in good faith, prosecutors must have probable cause to indict the third person at the time they offer lenity or communicate the threat.
See, e.g., United States v. Marquez,
The most analogous decision in our circuit is
Whalen.
In that case, a section 2255 petitioner alleged that the government had coerced him into pleading guilty by threatening to prosecute his wife.
Whalen,
Considering the rationale of Whalen, as well as the weight of authority from other circuit courts, we hold that the standard of good faith requires probable cause: To lawfully threaten third persons with prosecution during the course of plea negotiations, the government must have probable cause that those third pérsons committed the crime that the government threatens to charge. 4
Applying this rule to the case at bar, we find that the district court failed to apply the appropriate legal standard for ascertaining good faith. In its order denying appellant’s petition, the district court stated that it “accepted] the Government’s assertions that any investigation of Petitioner Wright’s family was being conducted in good faith under the law as it existed at the time of that investigation.” The court did not examine whether the prosecution had probable cause to indict any of appellant’s family members at the time it allegedly made the threats. Its finding that the prosecution acted in good faith was based purely on the government’s assertions to that effect.
At the evidentiary hearing, appellant offered evidence plausibly showing that the prosecution never had the requisite probable cause. In response, the government merely averred that the prosecution had acted in good faith. 5 On this record, there is no evidence from which to conclude that the prosecution had probable cause to indict those persons it allegedly threatened to indict. If the prosecution actually made the alleged threats, the threats caused appellant *500 to plead guilty, and the threats were not supported by probable cause, the prosecution violated appellant’s right to due process. We therefore remand to the district court for these factual findings.
Y. Conclusion
We affirm the district court’s denial of appellant’s petition with respect to his claims that the prosecution unlawfully violated appellant’s informal immunity agreement and withheld material evidence. We remand the case to the district court for further findings with respect to whether appellant has cause for his procedural default, including whether the prosecution actually threatened to indict members of his family and, if so, whether those threats caused appellant to plead guilty. If the district court finds such cause, it must then determine whether the prosecution had probable cause when it made the threats. The ease is REMANDED for further proceedings in accordance with this opinion.
Notes
. For purposes of addressing appellant’s first claim, we assume that the his plea was not the result of coercion. We address appellant's claim that his plea was coerced infra.
. The district court held that appellant had failed to show cause and that he had not demonstrated a fundamental miscarriage of justice. Because we address the merits of appellant's claim, we do not address the district court's findings on this issue.
. According to appellant, he was particularly concerned about the possible indictment of his father, who was ill with a serious heart condition at the time.
. Nothing in our holding restrains prosecutors from offering to halt criminal investigations of third persons that are initiated in good faith as consideration in plea negotiations. For instance, if an investigation into a third person has not yet uncovered enough evidence to constitute probable cause, the prosecution could still offer to cease that investigation in exchange for the defendant pleading guilty. In such a case, the prosecution is acting “with a high degree of good faith” because it is not claiming to be capable of doing more than the law permits. Our holding only prevents the prosecution from making threats that it cannot legally carry out, i.e., threatening to indict third persons when it does not have probable cause with which to do so.
. Aside from the probable cause issue, the government contended that prosecutors never made the alleged threats. AUSA Watson testified that the prosecution never threatened to indict members of appellant's family. In contrast, appellant's trial counsel, Mr. D.C. Thomas, who participated in the plea negotiations, testified that the prosecution told appellant that members of his family “would be indicted and prosecuted for mail fraud” if he did not plead guilty. Because *500 the district court concluded that the government conducted its investigation of appellant’s family members in good faith, it did not reach the question of whether the prosecution had actually made the alleged threats.
