Hunter v. United States: The “Miscarriage of Justice” Limit on Enforcing Sentencing Appeal Waivers

Court: U.S. Supreme Court  |  Date: June 18, 2026  |  Citation: 608 U. S. ___ (2026)

1. Introduction

Hunter v. United States arose from a federal fraud prosecution in which petitioner Munson Hunter III entered a written plea agreement. Hunter pleaded guilty to one count of aiding and abetting wire fraud in exchange for dismissal of nine other counts and a non-prosecution promise as to described conduct. The agreement contained a broad appeal waiver: Hunter “knowingly and voluntarily” waived the right to appeal his conviction and sentence, except for ineffective assistance of counsel. It also contained a “no oral modification” clause: “any modification” had to be “in writing and signed by all parties.”

At sentencing, the district court imposed a supervised-release condition requiring Hunter to participate in mental-health treatment and to “take all mental-health medications” prescribed by his physician. Hunter objected to the mandatory-medication aspect. After imposing sentence, the judge nonetheless stated: “You have a right to appeal,” and the prosecutor did not correct the statement.

Hunter appealed, arguing that the mandatory-medication condition infringed a “fundamental due process liberty interest” and that (i) appeal waivers are unenforceable when they would shield violations of fundamental rights, or (ii) the sentencing judge’s appeal-rights statement (plus prosecutorial silence) nullified the waiver. The Fifth Circuit dismissed, adhering to circuit precedent enforcing waivers except for ineffective assistance or sentences exceeding the statutory maximum. The Supreme Court granted certiorari to resolve a circuit split over whether appellate courts may decline to enforce waivers to prevent a “miscarriage of justice.”

2. Summary of the Opinion

The Court (Justice Kagan) vacated and remanded. It announced a new governing rule for federal sentencing appeal waivers: an agreement not to appeal a sentence is unenforceable when enforcing it would result in a miscarriage of justice—defined as leaving in place an egregious, obvious error that would bring the judicial system into disrepute.

The Court also rejected Hunter’s case-specific attempt to avoid the waiver based on the district judge’s misstatement at sentencing and the Government’s silence. The misstatement did not modify the written plea agreement, and the Government neither waived nor forfeited its right to enforce the waiver by failing to object at sentencing.

Because the Fifth Circuit had not applied a miscarriage-of-justice analysis, the Court declined to decide whether Hunter’s forced-medication challenge met the standard, invoking the principle that the Supreme Court is “a court of review, not of first view.”

3. Analysis

3.1. Precedents Cited (and How They Shaped the Decision)

A. Foundational limits: validity of plea waivers and ineffective assistance

The Court began from settled waiver doctrine in guilty pleas:

  • Brady v. United States, 397 U. S. 742 (1970): cited for the baseline requirement that a plea agreement term, including an appeal waiver, must be knowing and voluntary to be valid and enforceable.
  • Hill v. Lockhart, 474 U. S. 52 (1985): used to confirm that a plea (and thus an appeal waiver) is not knowing and voluntary if counsel’s advice fell outside the constitutionally required range; therefore, waivers “tainted by ineffective assistance” are unenforceable.

These cases define what the Court treated as common ground: validity is a prerequisite; the hard question is whether valid waivers can still be unenforced to protect institutional integrity.

B. The judiciary’s role in plea agreements and institutional interests

  • Santobello v. New York, 404 U. S. 257 (1971): the Court relied on its statement that acceptance of plea agreements is committed to “sound judicial discretion.” That discretion was pivotal to the Court’s institutional framing: courts are not passive enforcers of private bargains but necessary gatekeepers whose decisions give waivers legal effect.
  • Wheat v. United States, 486 U. S. 153 (1988): invoked for the proposition that federal courts have an “independent” institutional interest in ensuring proceedings “appear fair to all who observe them,” even when a defendant purports to waive a right.
  • United States v. Mezzanatto, 513 U. S. 196 (1995): supplied the Court’s language that some rules may be “so fundamental” that they could not be waived “without irreparably discrediting the federal courts,” and that automatic enforcement can “risk[] institutional harm.” The Court also drew from Mezzanatto’s famous “orangutans” illustration.
  • United States v. Josefik, 753 F. 2d 585 (CA7 1985): quoted via United States v. Mezzanatto as the source of the “trial by 12 orangutans” hypothetical, repurposed here to demonstrate that some outcomes are intolerable irrespective of party consent.
  • Greenlaw v. United States, 554 U. S. 237 (2008) (ALITO, J., dissenting): cited for the broader theme that the judiciary and public have an interest in correcting “grossly prejudicial errors of law that undermine confidence” in the legal system—supporting the majority’s integrity-based limit.

Collectively, these cases provided the doctrinal scaffolding for the Court’s key move: reframing appeal-waiver enforcement as implicating not only party autonomy, but also the judiciary’s own legitimacy.

C. Contract and litigation principles: modification, waiver vs. forfeiture, and a mirror-image plea-colloquy error

  • Hawkins v. United States, 96 U. S. 689 (1877): cited for the contract principle that “Mutual consent is required to modify” an agreement. The Court used it to reject the idea that a judge’s unilateral sentencing remark could “orally modify” the parties’ written plea bargain.
  • United States v. Olano, 507 U. S. 725 (1993): supplied the modern distinction between waiver (affirmative abandonment of a right) and forfeiture (failure to timely assert). The Court applied it to conclude that the prosecutor’s silence at sentencing was not “waiver,” and not “forfeiture” because the Government’s time to assert enforcement is after a notice of appeal.
  • Garza v. Idaho, 586 U. S. 232 (2019): cited to support the practical proposition that enforcement decisions occur after an appeal is filed and the Government can then decide whether to invoke the waiver.
  • Class v. United States, 583 U. S. 174 (2018): treated as a “nearly mirror-image” scenario. There, a district court mistakenly told a defendant he was giving up appeal rights when the plea had no appeal waiver; the Court refused to treat that exchange as a waiver. Here, similarly, the Government’s non-objection to a mistaken “right to appeal” statement did not alter the written appeal waiver.

This cluster of precedents explains why the Court separated two questions: (i) whether the waiver remained valid (yes), and (ii) whether a valid waiver can be unenforced to avoid institutional harm (sometimes).

D. The circuit split and the Court’s alignment with the “majority view”

The Court canvassed appellate approaches:

  • “Miscarriage of justice” approach (endorsed today): United States v. Boudreau; United States v. Khattak; United States v. Smith; United States v. Andis; United States v. Wells; United States v. Holzer; United States v. Guillen; and the substantively similar framing in United States v. Riggi.
  • Narrow-exceptions approach: the Fifth Circuit’s United States v. Barnes and United States v. White, and similar approaches in Portis v. United States, United States v. Nulf, and King v. United States.

The Supreme Court’s adoption of the “miscarriage of justice” limitation resolves the split in favor of the more flexible (but high-threshold) rule, displacing the Fifth Circuit’s categorical restraint.

E. Illustrative “egregious error” exemplars in sentencing

The Court emphasized it could not exhaustively list qualifying cases but offered exemplars, grounded in cited authorities:

  • Statutorily unauthorized sentences: United States v. Kim, 988 F. 3d 803 (CA5 2021) (declining waiver enforcement where sentence unauthorized by law).
  • Blatant constitutional errors and unconstitutional supervised-release conditions: People v. Zaring, 8 Cal. App. 4th 362 (1992) (pregnancy restriction example); and United States v. Elliott, 264 F. 3d 1171 (CA10 2001).
  • Minimum civilized procedure in sentencing: United States v. Adkins, 743 F. 3d 176 (CA7 2014) and United States v. Behrens, 375 U. S. 162 (1963).

These citations functioned less as direct holdings on appeal waivers and more as boundary markers: they demonstrate the kinds of errors that can undermine confidence in courts if insulated from appellate correction.

F. Remand discipline: the Supreme Court as a “court of review”

  • Cutter v. Wilkinson, 544 U. S. 709 (2005): supplied the “court of review, not of first view” principle justifying remand for the Fifth Circuit to apply the newly adopted standard to Hunter’s medication condition.

3.2. Legal Reasoning

A. The sentencing-hearing misstatement did not undo a written waiver

The Court treated the plea agreement as controlling: it had a written-only modification clause, and in any event there was no “mutual agreement” at sentencing to alter the waiver. A judge’s post-sentence remark about appellate rights could not rewrite the parties’ contract; it most plausibly reflected “a momentary mistake.”

B. Prosecutorial silence was neither waiver nor forfeiture

Applying United States v. Olano, the Court held silence was not an affirmative abandonment (waiver) and was not untimely assertion (forfeiture) because the Government’s appropriate time to invoke the waiver is after a notice of appeal. The Court thereby insulated waiver enforcement from being lost through non-objection at sentencing.

C. Why a “miscarriage of justice” safety valve is required

The Court’s central reasoning is institutional: because courts must accept plea agreements (Santobello v. New York) and appellate courts alone decide whether to enforce waivers, courts cannot disclaim responsibility for outcomes that would publicly discredit the judiciary. Automatic enforcement “no matter the kind or degree of error” could require courts to leave in place sentences that are plainly unlawful, unconstitutional, or imposed without basic procedure.

D. The standard is intentionally demanding

To protect plea bargaining’s utility, the Court refused a broad “fundamental rights” carve-out and rejected making ordinary sentencing mistakes appealable despite waivers. The “miscarriage of justice” limit applies only to “extreme cases” involving:

  • Egregious error;
  • Obvious error (“not one a judge could reasonably make”); and
  • Error of a kind that would undermine public confidence in the judiciary.

The Court listed examples—statutory-maximum violations, blatant constitutional errors (including unconstitutional supervised-release conditions), and sentences imposed without “some minimum of civilized procedure”—while stressing the list is not exclusive.

E. Application to Hunter left for remand

The Court did not decide whether the mandatory-medication condition qualifies under the new exception, remanding for the Fifth Circuit to assess whether enforcing the waiver would itself be a “miscarriage of justice.”

3.3. Impact

A. Immediate doctrinal change in waiver-enforcement jurisdictions

The decision directly displaces the Fifth Circuit’s rule (from United States v. White and United States v. Barnes) that recognized only ineffective assistance and statutory-maximum errors. It also pressures other “narrow exceptions” circuits to adopt the Supreme Court’s integrity-based safety valve.

B. A new appellate screening inquiry focused on institutional legitimacy

Courts of appeals must now conduct a threshold analysis even when a waiver is valid: would enforcement leave an obvious, egregious sentencing defect in place that would bring the judiciary into disrepute? This is a categorical change in framing—from “is there an exception?” to “would enforcement itself be institutionally intolerable?”

C. Limited but real leverage for defendants in extreme sentencing-error cases

Defendants who can show extraordinary defects—e.g., a plainly unlawful term, a blatant constitutional error, or a profound breakdown in sentencing procedure—have a path to appellate correction despite a waiver. But routine guideline disputes and ordinary legal errors remain barred.

D. Plea bargaining and prosecutorial incentives

The Court attempted to preserve waiver value in negotiations by setting a “high bar” and emphasizing that “standard-fare” sentencing mistakes do not suffice. The Government’s “floodgates” argument was rejected on the empirical observation that many circuits already operate under a miscarriage-of-justice limitation without being “awash” in waived appeals.

E. Supervised-release conditions are a likely battleground

The Court’s examples explicitly include “constitutionally infirm condition[s] of supervised release,” signaling that conditions that intrude on bodily integrity, family relationships, speech, or religion—if plainly unconstitutional—can fall within the safety valve. Hunter’s own challenge to compelled psychiatric medication will test how “obvious” and “egregious” an asserted constitutional defect must be.

F. Separate writings preview future controversies

  • Justice Gorsuch’s concurrence situates appeal waivers within the modern “conveyor belt” of plea bargaining and suggests additional scrutiny may be warranted for prospective waivers, gesturing to constitutional and statutory-waiver limits by referencing cases such as Sell v. United States, Home Ins. Co. v. Morse, and Alexander v. Gardner-Denver Co..
  • Justice Kavanaugh’s concurrence underscores that the Court’s exception is meant to be narrow and warns against lowering the bar.
  • Justice Barrett’s concurrence reframes the majority as an application of “procedural common law” and established waiver principles, not an assertion of “supervisory power.”
  • Justice Thomas’s dissent challenges the decision’s legal source, argues that appeal rights are statutory and waivable, and emphasizes historical absence of sentencing appeals, while also raising (without majority resolution) jurisdictional concerns by citing Trump v. New York.

4. Complex Concepts Simplified

  • Appeal waiver: a plea-bargain term where a defendant promises not to appeal a conviction and/or sentence. It is enforceable only if entered knowingly and voluntarily.
  • Knowing and voluntary: the defendant understands what right is being given up and chooses freely (not through coercion, misinformation, or ineffective counsel). This concept is anchored in Brady v. United States and Hill v. Lockhart.
  • Waiver vs. forfeiture: under United States v. Olano, waiver is intentional abandonment; forfeiture is a failure to timely assert. Here, the Government’s silence at sentencing was neither, because enforcement is typically invoked after an appeal is filed.
  • Miscarriage of justice (as used here): not “any unfairness,” but an extreme, obvious sentencing error that would harm public confidence in courts if left uncorrected. Ordinary legal mistakes do not qualify.
  • Supervised release condition: a rule that applies after prison during a monitoring period. Conditions can be challenged as unlawful or unconstitutional, but after Hunter, an appeal waiver bars most such challenges unless the condition reflects an egregious, obvious defect meeting the miscarriage-of-justice threshold.
  • “Court of review, not of first view”: the Supreme Court generally does not decide issues not addressed below; it remands, as in Cutter v. Wilkinson.

5. Conclusion

Hunter v. United States establishes a nationwide rule limiting enforcement of sentencing appeal waivers: even a valid waiver is unenforceable when enforcement would perpetuate an obvious, egregious sentencing error that would bring the judicial system into disrepute. The Court grounded this rule in the judiciary’s indispensable role in approving plea agreements and in its independent institutional interest in the perceived fairness and legality of criminal adjudication, drawing on Santobello v. New York, Wheat v. United States, and United States v. Mezzanatto.

At the same time, the Court preserved waiver stability by holding that stray judicial comments about appeal rights and prosecutorial silence do not rewrite plea bargains, and by setting a deliberately high threshold for the miscarriage-of-justice safety valve. The result is a calibrated doctrine: appeal waivers remain broadly enforceable, but not at the cost of entrenching sentences that would visibly and profoundly compromise the judiciary’s legitimacy.