Appeal-Waiver “Miscarriage of Justice” Safety Valve

Case: Hunter v. United States, 608 U. S. ___ (2026) (Decided June 18, 2026)
Court: U.S. Supreme Court  |  Disposition: Vacated and remanded

1. Introduction

Hunter arises from a common modern plea-bargaining device: the appeal waiver, by which a defendant—before knowing the ultimate sentence—promises not to appeal it. Munson Hunter III faced ten counts of bank and wire fraud. He entered a written plea agreement, pleaded guilty to one count of aiding and abetting wire fraud, and received dismissal of the remaining counts plus a non-prosecution promise. In exchange, he broadly waived appellate review of both conviction and sentence, reserving only ineffective-assistance claims.

The sentencing dispute involved a supervised-release condition requiring Hunter to take all mental-health medications prescribed by his treating physician. Hunter objected to mandatory medication. After imposing the condition, the District Court mistakenly told Hunter, “You have a right to appeal,” and the prosecutor did not correct the statement.

On appeal, Hunter challenged the medication condition as infringing a “fundamental due process liberty interest” in refusing unwanted medication. The Government invoked the waiver. The Fifth Circuit dismissed under its narrow approach (enforcing waivers except for ineffective assistance or sentences above the statutory maximum), relying on United States v. White and United States v. Barnes. The Supreme Court granted certiorari to resolve a circuit split over whether courts may refuse enforcement to prevent a “miscarriage of justice.”

Key Issues

• Modification/negation: Did the District Court’s “right to appeal” statement (and the Government’s silence) modify or void the appeal waiver?
• Enforcement limits: If the waiver is valid, are there any limits on enforcement beyond “knowing and voluntary” and ineffective assistance?
• Standard selection: Should courts follow an “always enforce” rule, the Fifth Circuit’s narrow exceptions, or a broader “miscarriage of justice” safety valve?

2. Summary of the Opinion

The Court (Justice Kagan) held:

1. The waiver remained valid: the District Court’s misstatement at sentencing and the Government’s silence did not modify the plea agreement or waive the Government’s right to enforce it.
2. A valid appeal waiver is nevertheless unenforceable when enforcement would create a miscarriage of justice—a high-bar exception reserved for obvious, egregious errors that would undermine public confidence in the judiciary.
3. The Court declined to decide whether Hunter’s medication-condition challenge satisfies that standard and remanded to the Fifth Circuit, invoking the “court of review, not of first view” principle from Cutter v. Wilkinson.

3. Analysis

3.1 Precedents Cited (and How They Shape the Decision)

Also central to the circuit-split framing: The Court noted that most circuits had already adopted some miscarriage-of-justice formulation (e.g., United States v. Boudreau, United States v. Khattak, United States v. Andis, United States v. Wells, United States v. Holzer, United States v. Guillen, and United States v. Riggi), while a minority used narrower exception lists (e.g., Portis v. United States, United States v. Nulf, King v. United States).

3.2 Legal Reasoning

A. Why the sentencing-court “right to appeal” remark did not undo the waiver

• No contract modification: The plea agreement required any modification to be in writing and signed by all parties. Even ignoring that clause, modification requires mutual consent (Hawkins v. United States), which was absent. A judge’s misstatement cannot rewrite a bargain whose operative intent is the parties’.
• No Government waiver/forfeiture: Under United States v. Olano, waiver requires affirmative abandonment; mere silence is not enough. For forfeiture, timing matters: the Government’s time to invoke an appeal waiver is after the notice of appeal, not at sentencing (Garza v. Idaho).
• Analogy to Class v. United States: Just as a judge’s mistaken statement did not create an appeal waiver in Class, a judge’s mistaken statement did not negate an existing waiver in Hunter.

B. Why the Court rejected both “always enforce” and the Fifth Circuit’s narrow list

The Court’s analytic pivot is institutional: because courts must accept pleas and because appellate courts alone decide whether to enforce waivers, waiver enforcement is not purely a private contract question. Enforcement “cements into place” a sentence “whether or not lawful,” so the judiciary’s legitimacy is implicated.

• Institutional legitimacy limits private waiver: Drawing on Wheat v. United States and United States v. Mezzanatto, the Court reasoned that some outcomes are intolerable regardless of party agreement because they would “risk institutional harm.”
• Concrete reductio examples: Even if the Fifth Circuit permits appeals only for statutory-maximum errors, other blatant legitimacy-threatening errors exist: sentencing infected by race or religion bias, coercive reproductive conditions (illustrated with People v. Zaring), or a sentence chosen by an “orangutan.”

C. The adopted standard: “miscarriage of justice”

The Court adopted the majority approach: a waiver is unenforceable if enforcement would cause a miscarriage of justice, defined with stringent criteria:

• High bar: reserved for “extreme cases.”
• Obviousness: the error must be “obvious—not one a judge could reasonably make.”
• Egregiousness and legitimacy: the error must undermine public confidence and bring the judiciary into disrepute.
• Not for ordinary guideline or factor disputes: standard misapplications of sentencing law do not suffice.

D. Non-exclusive guidance categories (the Court’s examples)

1. Unauthorized-by-statute sentences: including terms above the maximum.
2. Blatant constitutional error: impermissible factors (e.g., race) or constitutionally infirm supervised-release conditions.
3. Absence of minimum civilized procedure: sentencing without baseline lawful process (invoking United States v. Behrens and United States v. Adkins).

E. Why remand instead of deciding Hunter’s claim

Because the Fifth Circuit had not applied a miscarriage-of-justice test at all, the Court declined to decide whether forced medication as a supervised-release condition meets the standard, citing Cutter v. Wilkinson.

3.3 Impact

Immediate doctrinal impact

• Uniform minimum standard: Circuits that previously treated “knowing and voluntary” as effectively dispositive (or used narrow exception lists) must now recognize an integrity-based outer limit.
• Appellate gatekeeping becomes more explicit: Courts of appeals must evaluate whether alleged sentencing errors cross the “obvious/egregious/legitimacy” threshold before enforcing the waiver.
• Fifth Circuit shift: The Fifth Circuit’s United States v. White/United States v. Barnes framework is displaced by a broader, though still narrow, standard.

Practical effects on plea bargaining and sentencing

• Waivers remain valuable: The Court emphasized the exception is narrow, aiming to preserve the Government’s reliance interest in predictable finality while preventing legitimacy crises.
• Litigation focus shifts: Defendants with waivers are incentivized to frame challenges as “obvious” and “system-discrediting,” while the Government will argue errors are debatable or routine.
• Supervised release conditions under scrutiny: The Court’s express inclusion of “constitutionally infirm condition[s] of supervised release” signals that some release-condition disputes can penetrate waivers if the constitutional defect is blatant.

Signals from separate opinions

• Justice Gorsuch (joined by Justices Sotomayor and Jackson): Welcomes the safety valve as a “start,” situating it in a broader critique of plea bargaining and appeal waivers; points to constitutional unwanted-medication precedents like Sell v. United States and emphasizes sentencing legitimacy concerns (also discussing guidelines errors with reference to Rosales-Mireles v. United States and procedure under Gall v. United States).
• Justice Kavanaugh (joined by Justices Alito and Barrett): Stresses the majority’s “high bar” and warns against reading the concurrence to lower it.
• Justice Barrett (solo): Frames the decision as grounded in waiver principles and “procedural common law,” not an assertion of supervisory power; relies on Johnson v. Zerbst and Shutte v. Thompson to emphasize waiver doctrine’s built-in limits.
• Justice Thomas (dissent): Argues there is no lawful source for the new exception; treats the holding as policy-driven and potentially an improper exercise of supervisory power; underscores historical absence of sentencing appeals and the Rules Enabling Act process.

4. Complex Concepts Simplified

• Appeal waiver: A term in a plea agreement where the defendant promises not to appeal (often including the sentence). It is traded for prosecutorial concessions (charge dismissals, recommendations, etc.).
• Knowing and voluntary: A waiver is valid only if the defendant understands what is being given up and chooses freely. If counsel was ineffective in advising, the waiver may be invalid (Hill v. Lockhart).
• Waiver vs forfeiture: Under United States v. Olano, waiver is intentional abandonment; forfeiture is failing to assert a right on time. The Government’s silence at sentencing did neither because enforcement is properly raised after the notice of appeal.
• Miscarriage of justice (as used here): Not “any error,” but an extreme, obvious, legitimacy-threatening sentencing defect—so serious that letting it stand would discredit the courts.
• Supervised release condition: Rules a defendant must follow after prison. Some conditions can implicate constitutional rights; the Court indicated that “blatant constitutional” defects in such conditions may defeat an appeal waiver.
• “Court of review, not of first view”: The Supreme Court generally does not decide issues not passed on below; it sends them back for initial application (Cutter v. Wilkinson).

5. Conclusion

Hunter v. United States recalibrates the law of plea-based appeal waivers in sentencing: even a valid, knowing, and voluntary waiver is not absolute. Because courts are central actors in approving pleas and enforcing waivers, the judiciary must retain a narrow power to refuse enforcement when doing so would entrench an obvious, egregious error that would undermine public confidence.

The decision preserves the general enforceability of appeal waivers while installing a legitimacy-protecting safety valve. On remand, the Fifth Circuit must decide whether the mandatory-medication supervised-release condition—challenged as a fundamental liberty infringement—meets the Court’s newly adopted miscarriage-of-justice standard.