Plain Error and What Survives Forfeiture
Forfeiture is not always fatal. A court may notice a mistake that nobody objected to at the time, but only after four separate questions have been answered in the appellant's favor, and the appellant carries the weight on every one of them.
The rule in short
Federal Rule of Criminal Procedure 52(b) permits a court to consider a plain error that affects substantial rights even though it was not brought to the trial court's attention, and Federal Rule of Evidence 103(e) states the same power for evidentiary rulings. The standard has four parts: there must be an error, it must be plain, it must affect substantial rights, and the court must decide that the error seriously affects the fairness or integrity of judicial proceedings.
An argument that was never made in the trial court is forfeited. Forfeiture does not always end the matter, because appellate courts retain a limited power to correct mistakes nobody objected to. That power is exercised through the plain error doctrine, and it is narrow by design.
Where the doctrine comes from
Federal Rule of Criminal Procedure 52(b) provides that a plain error that affects substantial rights may be considered even though it was not brought to the court's attention. Federal Rule of Evidence 103(e) states a parallel power for evidentiary rulings. Federal Rule of Civil Procedure 51(d)(2) supplies a version for jury instructions in civil cases.
The doctrine has a companion that runs the other way. Rule 52(a) directs that any error that does not affect substantial rights must be disregarded, and 28 U.S.C. 2111 says the same thing for the courts of appeals generally. Read together, the provisions describe a system in which some errors are ignored because they made no difference and others are ignored because nobody raised them in time.
The four questions in order
First, there must be an error, meaning a deviation from a legal rule that was not waived. A right that was intentionally relinquished is not merely forfeited, and no error occurs when a party gets what it asked for. This is why courts pay close attention to whether counsel said nothing or said that there was no objection.
Second, the error must be plain, meaning clear or obvious rather than subject to reasonable dispute. Where a question is genuinely unsettled, or where the circuits have divided and the governing circuit has not spoken, the error is not plain even if the appellate court now decides the point in the appellant's favor.
Third, the error must affect substantial rights, which ordinarily means it affected the outcome of the proceeding. The appellant carries this burden, and satisfying it requires pointing to something in the record that shows a reasonable probability of a different result. Speculation that a jury might have been influenced is not enough.
Fourth, even where the first three are met, correction is discretionary. The court asks whether the error seriously affects the fairness, integrity or public reputation of judicial proceedings. This step is not a formality: courts have declined to correct plain, prejudicial errors where the evidence of guilt or liability was overwhelming and the error was procedural.
Forfeiture is the failure to assert a right in time; waiver is the intentional relinquishment of a known right. A forfeited claim gets plain error review. A waived claim gets nothing, because there is no error to correct where the party asked for the very thing it now complains of. Stipulating to an instruction, agreeing that an exhibit may be received, and expressly withdrawing an objection all create waiver, and appellate courts distinguish these from silence with some care.
Clear or obvious, and measured when
Plainness is judged against settled law, and the settled point in time is generally the time of appellate consideration. An error that becomes clear only after an intervening decision may still be plain. An error that depended on an argument no court had accepted at the time of trial and none has accepted since will not be.
The requirement is often what defeats novel claims. A party who identifies a genuine flaw in a jury instruction, but must reason from three cases in other circuits to establish it, has not shown plainness however persuasive the reasoning. That is the price of not having objected, and it is the reason preservation is treated as the more important skill.
| Category | What happened below | Standard applied | Who bears the burden on prejudice |
|---|---|---|---|
| Preserved error | Timely specific objection and a ruling | The applicable standard of review | The party defending the judgment |
| Forfeited error | No objection, no intentional relinquishment | Plain error, four parts | The appellant |
| Waived right | Express agreement or withdrawal | No review | Not reached |
| Structural error | Defect in the framework of the trial | Not measured against the record | Effect generally presumed |
| Constitutional error, preserved | Objection made and overruled | Harmless beyond a reasonable doubt | The government |
Civil practice and the errors that are not measured
The doctrine exists in civil litigation but is applied more grudgingly. Rule 51(d)(2) authorizes consideration of a plain error in the instructions that affects substantial rights, and courts have located a general residual power outside that rule. In practice civil appellants who failed to object rarely obtain relief, partly because the interests at stake are usually financial and partly because both sides had counsel and an opportunity to speak.
Structural errors sit outside the ordinary calculation. Because they define the framework in which the trial occurs, their effect cannot be assessed by asking what the jury would otherwise have done. Whether a structural error automatically satisfies the third and fourth plain error requirements remains unsettled, and courts have resolved the question differently depending on which right is involved.
Arguing it, and arguing around it
An appellant should never concede forfeiture without first testing whether the issue was preserved by something else in the record: a motion in limine that drew a definitive ruling, a written submission, or an objection made on a related ground. The requirements are set out in the rules governing objections, offers of proof and forfeiture, and preservation is often established by a document rather than by a spoken objection.
Where forfeiture is unavoidable, the brief has to address all four requirements explicitly, because a court will not supply the analysis. It also helps to identify the standard that would have applied had the point been preserved, using the framework for sorting questions of law, fact and the mixed ones, and to explain the prejudice in terms borrowed from the harmless error inquiry and how prejudice is shown.
Points to carry away
- Plain error review applies to a forfeited claim, not to one that was intentionally relinquished.
- The error must be clear or obvious under settled law rather than merely arguable.
- The appellant ordinarily bears the burden of showing an effect on the outcome.
- Even a satisfied test leaves correction to the appellate court's discretion.
- In civil cases the doctrine exists but relief is granted far more sparingly.
- Structural errors are treated differently because their effect cannot be measured.
Questions readers ask
Does an error have to be plain when it was made or when the appeal is decided?
Courts assess plainness at the time of appellate review. Where the law was unsettled at trial but a controlling decision has since resolved it, the error can be plain even though the trial judge could not have known. That rule prevents an appellant from being penalized for the state of the law at a moment nobody controlled. It cuts the other way too: an error that was clear at trial but has since been made doubtful by later authority will usually not support relief.
Who has to prove prejudice under plain error review?
The appellant, and this is the main structural difference from harmless error. On a preserved claim, the party defending the judgment ordinarily bears the burden of showing that the error did not affect the outcome. On a forfeited claim, the appellant must show a reasonable probability that but for the error the result would have been different. Shifting that burden is what makes preservation valuable, and it explains why most plain error arguments fail at the third step rather than the first.
Are some errors reviewable even though no objection was made and no prejudice is shown?
A narrow class. Structural errors affect the framework within which a trial proceeds rather than a discrete step in it, and their consequences cannot be measured against the rest of the record. The complete denial of counsel, a biased judge, and the denial of a public trial are recognized examples. Courts have not fully settled whether such an error automatically satisfies the third and fourth plain error requirements, and the answer varies by circuit and by the specific right involved.
Sources
- Cornell Legal Information Institute — Federal Rule of Criminal Procedure 52, Harmless and Plain ErrorThe two subsections placing harmless error and plain error side by side.
- Cornell Legal Information Institute — Federal Rule of Evidence 103, Rulings on EvidenceThe provision preserving the power to notice a plain error affecting a substantial right.
- Cornell Legal Information Institute — Federal Rule of Civil Procedure 51, Instructions and ObjectionsThe civil clause allowing consideration of a plain instructional error despite no objection.
- Cornell Legal Information Institute — 28 U.S.C. 2111, Harmless ErrorThe statutory direction to disregard errors that do not affect substantial rights.
- Cornell Legal Information Institute — Federal Rule of Criminal Procedure 51, Preserving a Claimed ErrorWhat a party must do to keep a claim out of the plain error track.
- United States Courts — Current Rules of Practice and ProcedureOfficial rule text and committee notes on the treatment of unpreserved claims.
Liberty Law Library is a publication, not a law firm. This article states general rules and cites its sources; it is not advice about any particular case, and the law differs by state and changes over time.
More in Appellate Practice
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Federal Rule of Appellate Procedure 10(a) defines the record on appeal as the original papers and exhibits filed in the district court, the transcript of proceedings, and a certified copy of the docket entries. Rule 10(b) requires the appellant to order a transcript or certify that none will be ordered, and to serve a statement of issues where only part is ordered. Rules 10(c) and 10(d) supply a prepared statement or an agreed statement where no transcript is available.
Rehearing and Rehearing En Banc
Federal Rule of Appellate Procedure 40 allows a petition for panel rehearing stating with particularity each point of law or fact the petitioner believes the court overlooked or misapprehended. Rule 35 governs rehearing en banc, which is not favored and is ordered only where necessary to secure or maintain uniformity of the court's decisions or where the proceeding involves a question of exceptional importance. Rule 41 controls when the mandate issues and how it may be stayed.
Brief Requirements and the Argument Section
Federal Rule of Appellate Procedure 28(a) lists what an appellant's brief must contain, including a corporate disclosure statement, tables, a jurisdictional statement, a statement of the issues, a statement of the case with record references, a summary of the argument, the argument itself with the standard of review for each issue, a conclusion, and the required certificates. Rule 32 governs form, typeface and the word limits, and requires a certificate of compliance.