How to Get a New Trial

A motion for a new trial asks the same trial court to throw out a conviction and start over, based on something that happened during or after the trial — not just because you disagree with the verdict. The most common grounds are newly discovered evidence, juror misconduct, a legal error the judge made, and a Brady violation (the prosecution hiding evidence favorable to the defense). These motions almost always come with short, strict deadlines — in many courts you have as little as a few days to a few weeks after the verdict or sentencing to file, so if you're considering this, treat the clock as running right now and talk to a criminal defense lawyer immediately.

What a motion for a new trial actually is

After a conviction, a defendant can ask the trial judge — the same judge who presided over the case — to vacate the verdict and order a new trial. This is different from a direct appeal, which goes to a higher appellate court and generally reviews only the existing trial record for legal errors. A motion for new trial stays with the trial judge and can sometimes bring in evidence that wasn't part of that record, such as proof of jury misconduct or evidence discovered after the trial ended.

Judges do not grant these often. Courts favor finality, and a new trial means witnesses testify again, evidence gets reintroduced, and the state has to retry its case. Because of that, the defendant carries the burden of showing a real, serious problem — not just a claim that the jury "got it wrong."

The main grounds courts recognize

Newly discovered evidence

This is evidence that genuinely did not exist, or could not have been found with reasonable diligence, before or during the trial. Courts typically look for all of the following before granting relief on this ground:

• The evidence was discovered after the trial ended.
• It could not have been discovered earlier even with reasonable effort by the defense.
• It is not merely repetitive of evidence already presented, or used only to attack a witness's credibility.
• It is material — meaning it would probably produce a different result at a new trial, not just add a little doubt.

A witness recanting testimony, a confession by someone else, or a newly located alibi witness can sometimes qualify. A stronger version of an argument the defense already made at trial generally does not.

Juror misconduct

Jurors are required to decide a case based only on the evidence and instructions given in court. A new trial may be available if a juror:

• Concealed bias or a relationship to a party during jury selection.
• Investigated the case outside the courtroom (visiting a scene, searching the internet, talking to outside people about the case).
• Was exposed to outside information about the case, such as news coverage or a comment from someone not in the courtroom.
• Engaged in serious misconduct during deliberations, such as pressuring other jurors with information from outside the trial.

Courts generally cannot look into a juror's internal reasoning or how they weighed the evidence — that's protected to keep deliberations honest and final. The misconduct usually has to involve an outside influence or an undisclosed bias, not just how a juror thought about the case.

Legal error at trial

This covers mistakes by the judge that affected the fairness of the trial: wrongly admitting or excluding key evidence, an incorrect jury instruction, a violation of a defendant's constitutional rights (for example, the right to counsel recognized in Gideon v. Wainwright (1963), the warnings required under Miranda v. Arizona (1966), or protections against unreasonable searches under Mapp v. Ohio (1961)), or a violation of the speedy trial right described in Barker v. Wingo (1972). Not every error qualifies — many legal-error claims are better suited to a direct appeal rather than a new-trial motion, and a lawyer can help sort out which route fits the specific mistake.

Brady violations — the prosecution withheld evidence

Under Brady v. Maryland (1963), the prosecution has a constitutional duty to turn over evidence favorable to the defense that is material to guilt or punishment — including evidence that could impeach a witness. If it comes out after trial that the prosecution sat on such evidence, that can be strong grounds for a new trial. The defense generally has to show the evidence was favorable, that the prosecution suppressed it (whether deliberately or not), and that it was material enough to undermine confidence in the outcome.

Ineffective assistance of counsel

A new trial can also be sought when the defendant's own lawyer performed so poorly that it undermined the fairness of the trial. Under Strickland v. Washington (1984), a defendant generally must show both that the lawyer's performance fell below a reasonable standard and that this failure likely changed the outcome. This ground is sometimes raised in a new-trial motion and sometimes in a separate post-conviction proceeding, depending on the jurisdiction and the stage of the case.

Deadlines are the biggest trap — act fast

This is the single most important thing to understand: motions for a new trial are almost always subject to very short deadlines that run from the verdict or from sentencing, and they are strictly enforced. Miss the window and the trial court may lose the power to even consider the motion, regardless of how strong the evidence is. Some grounds — particularly genuinely newly discovered evidence — may have a longer or separate deadline than motions based on trial errors, but the specific time limits differ by state and by federal versus state court, and they are not something to guess at. Do not assume you have "plenty of time." Confirm the exact deadline in your jurisdiction with a lawyer or the court clerk immediately after a verdict or sentencing.

What to do if you think you have grounds

1. Contact a criminal defense or appellate attorney immediately. Do this within days of the verdict or sentencing, not weeks. If you already have a lawyer, raise it with them right away; if you're unrepresented, ask the court about appointed counsel for post-trial proceedings.
2. Preserve everything. Save documents, names of witnesses, dates, and any communications related to the new evidence, the juror issue, or the withheld information. Do not discard anything.
3. Do not contact jurors yourself. Investigating juror misconduct is sensitive and often restricted by court rules; an improper approach to a juror can backfire and even create new legal problems. Let your lawyer or an investigator handle it properly.
4. Get the trial transcript and case file. Your lawyer will need the record to identify legal errors and build the motion.
5. File within the deadline, even if the motion isn't fully developed — some courts allow supplementing a timely-filed motion with more detail later, but the initial filing itself usually cannot be late.
6. Prepare for a hearing. The judge may hold a hearing where the defense presents the new evidence, witness testimony, or arguments about the error before ruling.

If the motion is denied

Denial of a new-trial motion doesn't necessarily end things. Depending on the jurisdiction, the defendant may still pursue a direct appeal to a higher court, and separately, a different track of post-conviction relief (sometimes called habeas corpus or a state post-conviction petition) may be available for certain constitutional claims, often on a different timeline than the new-trial motion. These are distinct procedures with their own rules and deadlines, so ask a lawyer about all the options rather than assuming one motion is the only chance.

This article is general legal information, not legal advice, and reading it does not create an attorney-client relationship. If you are considering a motion for a new trial, contact a licensed criminal defense attorney in your jurisdiction right away because the deadlines are short and unforgiving.