Appeal Process Criminal: How to Appeal a Criminal Conviction
The verdict has been read: guilty. The sentence has been imposed. But for many defendants, the fight is not over. The criminal appeal process offers a path to challenge a conviction or sentence based on legal errors that occurred during the trial. While appeals are not retrials — the appellate court does not hear new evidence or reassess witness credibility — they provide a crucial check on the fairness and accuracy of the criminal justice system.
Approximately 80 to 90 percent of criminal convictions are affirmed on appeal in most jurisdictions. This statistic reflects the reality that appeals are difficult to win. But for the defendants who succeed, the result can be a new trial, a reduced sentence, or outright dismissal of charges. Understanding the appellate process is essential for anyone considering an appeal.
Grounds for Appeal
An appeal is not an opportunity to argue that the jury got it wrong. The appellate court will not second-guess the jury’s factual findings unless they are supported by no evidence at all. Instead, the defendant must identify specific legal errors that affected the trial’s outcome.
Common grounds for appeal include erroneous evidentiary rulings, improper jury instructions, prosecutorial misconduct, ineffective assistance of counsel, insufficient evidence, and sentencing errors. Each ground must be preserved by a timely objection at trial — the general rule is that a defendant cannot raise an issue on appeal that was not raised in the trial court.
Ineffective Assistance of Counsel
The Sixth Amendment guarantees the right to effective assistance of counsel. To win an appeal on this ground, the defendant must show two things under Strickland v. Washington (1984): that counsel’s performance fell below an objective standard of reasonableness, and that the deficient performance prejudiced the defense — meaning there is a reasonable probability that the outcome would have been different with competent counsel.
Ineffective assistance claims are difficult to prove. Courts are highly deferential to trial counsel’s strategic decisions and generally resist second-guessing choices that could be seen as reasonable trial strategy. However, clear failures — such as failing to investigate key witnesses, misunderstanding the law, or missing filing deadlines — can support a successful claim.
The Appellate Process
The appeal begins with the filing of a notice of appeal, which must be filed within a short time after the judgment — typically 10 to 30 days in criminal cases. Missing this deadline can forfeit the right to appeal entirely.
The Record on Appeal
The appellant must assemble the record on appeal, which includes the trial transcript, all documents filed in the trial court, and any physical exhibits admitted into evidence. The trial transcript is the most critical component — without a complete transcript, the appellate court cannot evaluate what happened at trial.
The cost of preparing the record can be substantial. Indigent defendants are entitled to a free transcript and appointed counsel for their first appeal as of right. Discretionary appeals, such as petitions for review by the state supreme court or the U.S. Supreme Court, do not carry a right to appointed counsel.
Appellate Briefs
The heart of the appeal is the written brief. The appellant’s brief must identify the errors committed at trial, explain why they were errors, and argue why they require reversal. The appellee’s brief responds, arguing either that the claimed errors did not occur or that any errors were harmless and did not affect the outcome.
The brief must include citations to the record and to legal authority. Ineffective briefing can doom an otherwise meritorious appeal. The criminal defense strategies guide emphasizes the importance of preserving issues for appeal through timely objections and motions at trial.
Oral Argument
Some appellate courts hear oral argument, where attorneys for both sides appear before the court to answer questions. Oral argument is typically brief — 15 to 30 minutes per side — and the judges use the time to probe the weaknesses in each party’s position. Many appeals are decided without oral argument based solely on the briefs.
Standards of Review
The appellate court applies different standards of review to different issues. Questions of law — such as the interpretation of a statute or the meaning of a constitutional provision — are reviewed de novo, meaning the appellate court gives no deference to the trial court’s conclusion.
Questions of fact are reviewed for clear error, a highly deferential standard. Mixed questions of law and fact — such as whether the police had reasonable suspicion for a stop — are reviewed de novo in federal courts, though state courts vary.
Evidentiary rulings are reviewed for abuse of discretion, meaning the appellate court will affirm unless the trial court’s decision was arbitrary or unreasonable. Improper jury instructions and claims of insufficient evidence are reviewed de novo.
Harmless Error and Structural Error
Not every error requires reversal. Most errors are subject to harmless error review — if the error did not affect the outcome of the trial, the conviction stands. The prosecution bears the burden of proving that the error was harmless beyond a reasonable doubt for constitutional errors, or by a preponderance of the evidence for non-constitutional errors.
A small category of errors is considered structural — errors that infect the entire trial and require automatic reversal regardless of their impact on the outcome. Structural errors include denial of counsel, a biased judge, racial discrimination in jury selection, and denial of a public trial.
Post-Conviction Review
Beyond the direct appeal, defendants may seek post-conviction relief through habeas corpus petitions. Habeas corpus is a separate civil proceeding that challenges the legality of the defendant’s detention, typically based on constitutional violations that were not resolved on direct appeal.
Federal habeas corpus, governed by the Antiterrorism and Effective Death Penalty Act of 1996, is substantially more limited than direct review. A federal court may grant habeas relief only if the state court’s decision was contrary to or an unreasonable application of clearly established federal law, or based on an unreasonable determination of the facts.
Habeas Corpus and Collateral Review
Beyond the direct appeal, defendants may seek collateral review through habeas corpus petitions, which are separate civil proceedings challenging the legality of detention. Federal habeas corpus, governed by the Antiterrorism and Effective Death Penalty Act of 1996, is substantially more limited than direct review. A federal court may grant habeas relief only if the state court’s decision was contrary to or an unreasonable application of clearly established federal law, or based on an unreasonable determination of the facts.
Habeas corpus petitions face strict procedural hurdles. They must be filed within one year of the conviction becoming final, and federal courts generally will not consider claims that were not exhausted in state court. Despite these obstacles, habeas corpus remains the primary remedy for constitutional violations that surface after the direct appeal is complete.
The Writ of Certiorari
The final stage of appellate review in the criminal justice system is a petition for a writ of certiorari to the U.S. Supreme Court. The Supreme Court is not required to hear any appeal — it selects roughly 1 percent of the thousands of petitions filed each year. The Court grants certiorari only when a case presents a significant legal question that has divided lower courts or when the Court decides to resolve an important constitutional issue.
Sentencing Appeals
Defendants may also appeal their sentences. Under the sentencing guidelines, a sentence that is procedurally unreasonable (based on an incorrect guideline calculation or failure to consider the required factors) or substantively unreasonable (disproportionate to the offense) may be reversed.
Sentencing appeals have become more common since Booker made the guidelines advisory. Appellate courts review sentences for abuse of discretion, asking whether the trial judge adequately considered the factors and imposed a sentence that was reasonable under the circumstances.
The Role of the Prosecution in Appeals
The prosecution may appeal certain rulings in limited circumstances. The double jeopardy clause prevents the government from appealing an acquittal, but the government may appeal pretrial rulings suppressing evidence, dismissals of charges based on legal defects, and sentences that are below the statutory minimum.
Frequently Asked Questions
How long does an appeal take? A typical criminal appeal takes 12 to 18 months from filing to decision. Complex cases can take longer. Habeas corpus proceedings can take years.
Can the defendant be released pending appeal? In some cases, the defendant may be released on bail pending appeal if they can show that the appeal raises substantial questions and that they are not a flight risk or danger. Most defendants remain incarcerated during the appeal.
What percentage of appeals succeed? Roughly 10 to 20 percent of criminal appeals result in reversal or modification of the conviction or sentence. The success rate varies by jurisdiction and the type of error claimed.
Can a successful appeal lead to a harsher sentence? In some jurisdictions, yes. On retrial, the defendant may face additional charges or a longer sentence, though due process limits vindictive sentencing.
What is the difference between a direct appeal and a writ of habeas corpus? A direct appeal challenges errors in the trial record. Habeas corpus is a separate civil action that can raise issues outside the record, such as ineffective assistance of counsel.
Criminal Procedure Overview — Sentencing Guidelines — Criminal Defense Strategies