Newly Discovered Evidence and the Motion That Carries It
Evidence that surfaces after a verdict has a short list of places to go. Each route has its own deadline and its own threshold, and the one that fits depends less on how compelling the evidence is than on when and how it came to light.
The rule in short
A motion for a new trial grounded on newly discovered evidence must be filed within three years after the verdict or finding of guilty, while any other ground carries a fourteen-day deadline. Most circuits require that the evidence was discovered after trial, that diligence would not have found it earlier, that it is material rather than merely cumulative or impeaching, and that it would probably produce an acquittal on retrial.
Evidence that surfaces after a verdict has a short list of places to go, and the route decides almost everything about how it is judged. A motion for a new trial in the trial court applies one test. A collateral attack applies another. A second collateral attack applies a third and much harder one. The strength of the evidence matters less at the threshold than when it appeared, why it was not found earlier, and what it is offered to prove.
The deadline and what starts it
A motion for a new trial grounded on newly discovered evidence must be filed within three years after the verdict or finding of guilty. That is a generous window by the standards of criminal procedure, and it is the only three-year period in the ordinary post-trial sequence. Every other ground for a new trial carries fourteen days from the same starting point, which means a motion resting on trial error, an instructional problem, or the weight of the evidence is effectively due before sentencing.
The distinction is enforced strictly, because it is the entire reason the longer period exists. A motion that recasts an argument available at trial as a discovery will be measured against the fourteen-day rule and denied as untimely. The clock runs from the verdict or the finding of guilt, not from sentencing and not from the conclusion of the appeal, and an appeal in progress does not stop it.
A collateral motion is on a separate schedule. Its limitation period can run from the date the facts supporting the claim could have been discovered through the exercise of due diligence, which is a discovery trigger rather than a filing deadline; the mechanics are set out in the one-year clock and its four starting points. The two routes can be open at once, and they ask different questions about the same evidence.
The elements most circuits require
Courts of appeals have converged on a multi-part test, stated in slightly different words from circuit to circuit. The evidence must have been discovered after trial. The failure to discover it must not be attributable to a lack of diligence by the defense. It must be material to the issues at trial rather than merely cumulative of what the jury already heard or merely impeaching. And it must be of a character that would probably produce an acquittal on retrial.
The last element does the most work and explains why so few motions succeed. It is not enough that the new material would have been admitted, or that it would have given the defense another argument. The court sets the new evidence against the record that produced the verdict and asks whether the outcome would probably change. Where the conviction rested on several independent strands, evidence that undermines one of them rarely clears that bar.
Diligence is the second frequent obstacle. Evidence that existed and was reachable at the time of trial is not newly discovered merely because nobody looked. The question is what a reasonable investigation would have turned up, which is why a motion of this kind often arrives paired with a claim about the quality of the representation; those claims are measured by the standard described in the ineffective assistance standard and its two parts.
A recurring mistake is to date the discovery from the moment its significance became apparent rather than from the moment the underlying fact became available. Courts measure from availability. A document sitting in a file the defense had, a witness whose name appeared in discovery, or a public record that could have been pulled will be treated as discoverable at the time of trial even if nobody understood what it meant until years later.
Impeachment, recantation and suppressed material
Three categories generate most of the disagreement among the circuits. The first is purely impeaching evidence. The traditional rule excludes it, on the reasoning that a jury that heard a witness and believed him is unlikely to change course because another attack was available. Several circuits apply that rule flatly. Others allow an exception where the witness was the entire case against the defendant and the impeachment would have destroyed him, treating the label as less important than the effect.
The second is recanted testimony. Some circuits use a relaxed standard for recantations, asking whether the court is reasonably satisfied that the trial testimony was false and whether the jury might have reached a different result without it. Others have rejected that approach and hold recantations to the ordinary test, requiring a probability of acquittal. The practical difference is substantial in a single-witness case.
The third is favorable material the government held and did not disclose. That is not really a discovery question at all. It is a due process claim with its own materiality standard, and the diligence element is displaced, because the reason the defense did not have the evidence was that it was withheld. Pleading it as a Rule 33 motion rather than as a disclosure violation forfeits the more favorable framework.
| Route | Deadline | What must be shown | What it produces |
|---|---|---|---|
| New trial motion, newly discovered evidence | Three years after the verdict or finding of guilty | Post-trial discovery, diligence, materiality, probable acquittal | A new trial in the district court |
| New trial motion, any other ground | Fourteen days after the verdict or finding of guilty | That the interest of justice requires it | A new trial in the district court |
| First collateral motion | One year from the latest applicable trigger, including discovery of the facts | A constitutional or jurisdictional defect in the judgment | Vacatur, resentencing, or a new trial |
| Innocence as a gateway | No fixed deadline; delay affects credibility | New reliable evidence that no reasonable juror would convict on | Review of a claim otherwise barred |
| Successive collateral motion | Authorization sought before filing | Clear and convincing evidence that no reasonable factfinder would have found guilt | Permission to file, not relief |
Innocence as a gateway and as a claim
Two very different things travel under the word innocence. The first is a gateway. New reliable evidence showing that no reasonable juror would have found the petitioner guilty beyond a reasonable doubt permits a court to consider a constitutional claim that a time bar or a procedural default would otherwise block. The gateway decides nothing about the merits; it removes an obstacle in front of them, and its operation in the default context is described in procedural default and the two ways around it.
The second is a freestanding claim, in which innocence is itself the constitutional violation. The Supreme Court has assumed without deciding that a truly persuasive showing would matter where an execution is at stake, and it has never held that such a claim is available in a noncapital case. Lower courts differ on whether to entertain one at all, and those that do describe a threshold higher than the gateway standard.
Where the evidence emerges after a first collateral motion has already been decided, the gate narrows again. Authorization from the court of appeals is required, and the statutory ground demands clear and convincing evidence that no reasonable factfinder would have found the movant guilty. That mechanism is set out in second or successive petitions and the gatekeeping order, and it is markedly stricter than the probable-acquittal test applied to a timely new trial motion.
Points to carry away
- A new trial motion grounded on newly discovered evidence must be filed within three years after the verdict or finding of guilty.
- Any other ground for a new trial must be raised within fourteen days after the verdict or finding of guilty.
- Most circuits require that the evidence was discovered after trial, could not have been found through diligence, is material and not merely cumulative, and would probably produce an acquittal.
- Circuits disagree over whether purely impeaching evidence can ever satisfy the test and over the standard applied to recanted testimony.
- A freestanding claim of innocence has never been recognized by the Supreme Court in a noncapital case, though innocence works as a gateway past a procedural bar.
- Where the evidence was favorable material withheld by the government, the claim is a due process claim with its own standard rather than a diligence question.
Questions readers ask
Does a witness who now says the testimony was false guarantee a new trial?
No, and recantations are treated with unusual suspicion. A witness who has told two contrary stories under oath has demonstrated a willingness to lie, so the later account is not automatically the true one. Courts examine the circumstances of the change, whether the witness had contact with the defendant or the defendant's associates, and whether anything independent corroborates the new version. Some circuits apply a relaxed standard for recantations that asks whether the jury might have reached a different verdict; others refuse that approach and hold recantations to the ordinary test.
What if the evidence was known to the defendant but never given to trial counsel?
It is generally not newly discovered. The diligence element looks to what the defense as a whole knew or could have found, and information the defendant possessed at the time of trial does not become new because it was never passed along. That said, the same facts may support a different claim. A failure to elicit information from the client, or to follow an obvious lead the client supplied, is argued as a defect in representation rather than as a discovery, and it travels under a different standard and a different deadline.
Can new evidence revive a claim that is already too late or already defaulted?
Sometimes, through a narrow equitable route. A credible showing of factual innocence supported by new reliable evidence, such that no reasonable juror would have found the petitioner guilty beyond a reasonable doubt, permits a court to reach a claim that would otherwise be barred by the limitation period or by a state procedural default. The showing opens the door; it does not decide the claim behind it. Unexplained delay in coming forward bears on how credible the showing appears rather than automatically defeating it.
Sources
- Fed. R. Crim. P. 33 — New TrialSets the three-year deadline for a motion grounded on newly discovered evidence and the fourteen-day deadline for every other ground.
- 28 U.S.C. § 2255 — Federal custody; remedies on motion attacking sentenceRuns a limitation period from the date the supporting facts could have been discovered through due diligence and gates a second motion on newly discovered evidence.
- 28 U.S.C. § 2244 — Finality of determinationContains the parallel discovery trigger for state prisoners and the clear and convincing showing required for a successive claim.
- 28 U.S.C. § 2254 — State custody; remedies in Federal courtsLimits the development of new facts in federal court where the factual basis was not developed in the state proceeding.
- Rules Governing Section 2254 and Section 2255 ProceedingsProvides for discovery on a showing of good cause and for expanding the record by affidavit and document.
- Fed. R. Civ. P. 60 — Relief from a Judgment or OrderSupplies the newly discovered evidence ground and one-year limit that govern reopening a civil judgment, including a habeas judgment.
Premier Defense Law 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.
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