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Key Facts
- Federal level: Jury nullification describes a jury’s deliberate decision to acquit despite believing that the evidence satisfies the charged law.
- Federal level: Federal jurors have the practical power to return such a verdict, but federal courts do not recognize a legal right to disregard the judge’s instructions.
- Federal level: Judges generally instruct jurors to decide facts from the evidence and apply the law provided by the court.
- Federal and state: Procedures and permitted jury instructions vary by jurisdiction, so federal doctrine should not be treated as a complete statement of every state’s law.
Jury nullification occurs when jurors return a not-guilty verdict even though they believe the evidence proves a violation of the charged law. The decision may reflect disagreement with the law, its enforcement, or the result jurors think conviction would produce.
Power is not the same as a legal right
A criminal jury has the practical ability to acquit because a valid acquittal generally cannot be reversed merely because a court believes the jury misapplied the law.
Federal courts nevertheless distinguish that practical power from a lawful entitlement to ignore instructions.
Federal jurors take an oath, evaluate facts, and are instructed to apply the legal rules supplied by the judge.
Why courts do not usually instruct juries to nullify
The Supreme Court’s decision in Sparf and Hansen v. United States established that federal criminal juries receive the law from the court and apply that law to facts found from the evidence.
Modern federal appellate decisions therefore permit judges to caution jurors that they must follow the law, while recognizing that an instruction should not falsely threaten punishment merely for the verdict returned.
Nullification differs from reasonable doubt
An acquittal based on reasonable doubt means jurors were not persuaded that the prosecution proved every required element.
Nullification assumes the jurors believe the legal proof is sufficient but choose not to convict for another reason.
A general verdict normally does not disclose which form of reasoning produced an acquittal, because jurors do not ordinarily issue a written explanation.
Federal and state rules can differ
The United States Constitution protects criminal jury trial rights, but trial procedure also comes from federal or state statutes, court rules, and precedent.
State courts may describe nullification and jury-instruction limits differently, so a federal case does not automatically resolve a state-court procedure.
