A mistrial is a trial that ends without a valid verdict because something has made it impossible to continue fairly. It isn’t the same as finding the defendant guilty or not guilty; the case may begin again with a new jury.
Why a mistrial happens
A judge may declare a mistrial when a serious problem affects the fairness or reliability of the proceedings. Common reasons include:
- A hung jury , meaning jurors can’t agree on a verdict.
- Improper or highly prejudicial evidence being shown to the jury.
- Misconduct by a lawyer, witness, juror or another participant.
- Juror misconduct, such as discussing the case outside court.
- A major illness, emergency or other event that prevents the trial from continuing.
- A legal or procedural error that can’t be corrected through instructions or other remedies.
A mistrial isn’t declared for every mistake. Courts generally consider whether the problem is serious enough to prevent the jury from reaching a fair decision.
What happens afterward?
Usually, the judge ends the trial, and the court may schedule a new trial before a different jury. The prosecution can often retry a criminal case, but that depends on the reason for the mistrial and the rules of the jurisdiction.
For example, if jurors remain deadlocked after genuine efforts to reach a unanimous decision, the judge may declare a mistrial. The defendant hasn’t been acquitted, so prosecutors may decide to try the case again.
Is a mistrial good or bad?
A mistrial isn’t automatically good or bad for either side. It can help a defendant avoid an unfair verdict, but a retrial can also mean more legal expense, stress and uncertainty. Prosecutors may reassess the evidence before deciding whether to proceed again. The key point is that a mistrial leaves the central question unresolved. It ends that particular trial, not necessarily the entire case.