A mistrial ends a trial before the jury returns a verdict, which means the defendant is neither convicted nor acquitted and the case resets to roughly where it stood the day before trial began. So what a mistrial does, in practical terms, is hand the case back to the prosecution with three choices: retry it, negotiate a plea, or drop it. For the defendant, it is a pause with real consequences, not a resolution.
What a Mistrial Does to Your Case Right Now
The moment the judge declares a mistrial, the proceeding stops. The jury is dismissed. The trial record closes. There is no conviction and no acquittal, and the case snaps back to its pre-trial posture.
Bail and custody conditions do not automatically change. A defendant who was free on bail generally stays free. A defendant held in custody generally stays in custody. The judge keeps authority to revisit the terms based on the circumstances of the mistrial, the severity of the charges, and any shift in flight risk or danger to the community, but nothing about release status changes on its own.
Mistrials usually come from one of a few sources: a hung jury that cannot reach the unanimous verdict required in federal and state criminal cases,1Constitution Annotated. Amdt6.4.4.3 Unanimity of the Jury serious misconduct by a lawyer or juror that cannot be cured by an instruction, or an unforeseen event like the death or illness of the judge, a juror, or counsel. The legal standard tying these together is “manifest necessity” — the idea that continuing would defeat the ends of justice.2Constitution Annotated. Amdt5.3.4 Re-Prosecution After Mistrial Why the first trial ended matters, because it shapes what the prosecution does next and whether a second trial is even allowed.
What Happens to Testimony From the First Trial
A common assumption is that everything said in the first trial disappears. It does not. The trial result is void, but sworn testimony survives.
If a defendant testified in the first trial and chooses not to testify in the retrial, the prosecution may be able to introduce that earlier testimony. If the defendant testifies again and tells a different story, the prosecution can use the first version to show the inconsistency. Anything said under oath can follow a defendant into the second trial.
There is one narrow carve-out. If the first trial was tainted by improperly admitted evidence and the defendant testified specifically to rebut that evidence, a court may bar the prosecution from using that rebuttal in the retrial. Outside that situation, prior sworn testimony is fair game. The rules of evidence also continue to govern how any prior conviction of the defendant can be used.3Legal Information Institute. Federal Rules of Evidence Rule 609 – Impeachment by Evidence of a Criminal Conviction
What the Prosecution Can Do Next
The prosecution holds the next move. Three paths are realistic, and the choice usually tracks why the first trial fell apart.
The most common outcome is a retrial. The government empanels a new jury and starts over. This happens often after a hung jury, especially when the deadlock leaned toward conviction.
Plea negotiations tend to intensify after a mistrial. A hung jury can expose weaknesses that were not obvious going in, and a prosecutor facing the cost and uncertainty of a second trial may offer a plea to a lesser charge. The defendant’s calculation shifts too. If the first jury came close to convicting, accepting a reduced charge may look better than rolling the dice again.
The third option is dismissal. If the first trial showed that key evidence is weaker than expected or that witnesses do not hold up, the prosecution may walk away. A dismissal without prejudice leaves the door open to refile within the statute of limitations. A dismissal with prejudice is permanent and functions like an acquittal.
What the Defendant Can Do
Defendants are not entirely passive after a mistrial. Under Federal Rule of Criminal Procedure 29, a defendant can ask the judge to enter a judgment of acquittal within fourteen days of the jury being discharged.4Legal Information Institute. Federal Rules of Criminal Procedure Rule 29 – Motion for a Judgment of Acquittal The argument is that the prosecution’s evidence was so weak that no reasonable jury could have convicted. If the judge grants it, the case ends with the same finality as a not-guilty verdict. The motion does not need to have been filed during the trial itself.
Judges grant these motions sparingly. The standard is high: a struggling jury is not enough. The evidence has to be so thin that conviction would have been legally unsupportable. Even so, when the prosecution’s case was weak and the mistrial came from something other than close factual disagreement among jurors, this motion is worth considering.
Can You Be Retried After a Mistrial?
Usually, yes. The Fifth Amendment bars putting someone on trial twice for the same offense, but a mistrial does not count as the kind of termination that blocks a second trial. Because there was no conviction and no acquittal, the government is treated as entitled to one complete opportunity to put its case before a jury that actually reaches a verdict.2Constitution Annotated. Amdt5.3.4 Re-Prosecution After Mistrial
When the defendant is the one who asked for the mistrial, retrial is almost always permitted. The Supreme Court treats the request as a deliberate choice to trade a verdict from that particular jury for a fresh start, reasoning that forcing a defendant to sit through a tainted trial and appeal a conviction would be worse.2Constitution Annotated. Amdt5.3.4 Re-Prosecution After Mistrial
The Narrow Prosecutorial Goading Exception
One situation can block a retrial even after a defense-requested mistrial. In Oregon v. Kennedy (1982), the Supreme Court held that if the prosecution deliberately provoked the defendant into asking for a mistrial, a second trial is barred.2Constitution Annotated. Amdt5.3.4 Re-Prosecution After Mistrial The standard is strict. The defendant has to show that the prosecutor’s misconduct was specifically designed to force a mistrial motion, not merely that the prosecutor acted improperly. A reckless mistake does not qualify. Only calculated sabotage does. When it applies, the court can dismiss the charges with prejudice and end the case for good.
How Long Before a Retrial
A federal defendant will not be left in limbo indefinitely. The Speedy Trial Act requires the new trial to begin within seventy days of the mistrial order.5Office of the Law Revision Counsel. 18 USC 3161 – Time Limits for Information or Indictment and for Trial Certain periods are excluded from that clock, including time spent on pretrial motions, continuances granted for good cause, and stretches when the defendant or a key witness is unavailable. Even with the exclusions, the seventy-day baseline gives the defense a concrete tool to push the case forward, and if the government misses the deadline without a valid reason the defendant can move to dismiss. State courts set their own speedy-trial rules, and most impose comparable limits.