What Is a Post-Conviction Petition?
A post-conviction petition is a legal filing that challenges a conviction or sentence after the direct appeal process has been exhausted. Unlike a direct appeal — which argues that something went wrong at trial or sentencing — a post-conviction petition can raise new issues: newly discovered evidence, constitutional violations that weren't raised before, or claims that the attorney who handled the trial or appeal was ineffective.
Post-conviction petitions go by different names depending on the court system. In federal court, the most common form is a habeas corpus petition under 28 U.S.C. § 2254 (for state prisoners) or § 2255 (for federal prisoners). In state court, the process varies by state — it may be called a petition for post-conviction relief, a writ of habeas corpus, a motion for new trial, or a rule 61 motion.
When Can You File One?
Timing is critical. Post-conviction petitions have strict deadlines called statutes of limitations, and missing them can permanently bar the claim.
- Federal habeas (§ 2254): Generally must be filed within one year of the conviction becoming final — usually after the direct appeal is decided and any certiorari petition to the Supreme Court is denied or the deadline passes.
- Federal § 2255: Same one-year rule for federal prisoners challenging their sentence.
- State post-conviction: Varies widely. Some states have two-year windows, others have shorter deadlines, and some require filing within a specific number of days of sentencing for certain claims.
The clock can be paused (tolled) in some circumstances — if new evidence is discovered, if a new constitutional rule applies retroactively, or while a properly filed state petition is pending. But these exceptions are narrow and courts apply them strictly.
If you're not sure whether the deadline has passed: consult a post-conviction attorney immediately. Missed deadlines are one of the most common reasons valid claims are never heard.
What Grounds Can a Post-Conviction Petition Raise?
The most common grounds for post-conviction relief include:
Ineffective Assistance of Counsel
Under the Sixth Amendment, defendants have the right to effective legal representation. If the trial attorney failed to investigate alibi witnesses, didn't challenge faulty forensic evidence, failed to object to improper jury instructions, or made other serious errors that affected the outcome, this can be grounds for post-conviction relief. The standard comes from Strickland v. Washington (1984): you must show both that the attorney's performance was deficient and that the outcome would likely have been different with adequate representation.
Brady Violations
Prosecutors are constitutionally required to disclose evidence that is favorable to the defense (Brady v. Maryland, 1963). If evidence was withheld — a witness statement that contradicted the prosecution's theory, forensic results that pointed away from guilt, a deal made with a key witness — and that evidence was material to the outcome, a Brady claim can support post-conviction relief.
Newly Discovered Evidence
If evidence has emerged since trial that wasn't available before — a witness recants, DNA testing excludes the defendant, a key witness is found to have lied — this can form the basis of a post-conviction claim. Courts apply different standards for newly discovered evidence, but the core question is whether the new evidence would likely have changed the outcome.
Constitutional Violations
Other constitutional claims — improper admission of evidence obtained through an illegal search, coerced confessions, juror misconduct, racial discrimination in jury selection — can also support post-conviction petitions if they weren't properly raised on direct appeal and if there's a valid reason they weren't.
How Families Can Help Build the Case
You don't need a law degree to contribute meaningfully to a post-conviction case. Families have made real differences by:
- Documenting everything: Gathering trial transcripts, police reports, evidence lists, attorney correspondence, and anything else from the original case.
- Finding witnesses: Locating people who weren't called at trial, who have since changed their account, or who have relevant information.
- Researching case law: Finding court decisions where similar claims succeeded — this is where CaseMatchAI is particularly useful. Surfacing the precedents that support the specific grounds being raised gives attorneys a stronger foundation to work from.
- Connecting with innocence organizations: Many innocence projects accept cases based on family referrals when the initial research shows promise.
Finding Help
Post-conviction work is specialized. Not all criminal defense attorneys handle it. Look for:
- Your state's innocence organization (directory at innocencenetwork.org)
- Federal and state public defender post-conviction units
- Law school innocence clinics
- The Innocence Project (for DNA cases)
- Private post-conviction attorneys (many work on contingency for strong cases)