What Is Burden of Proof in a Criminal Case? Beyond a Reasonable Doubt Explained

Last reviewed: October 5, 2026. This article is general information, not legal advice. Jury instructions and the rules for specific defenses vary by state; check your state's law or ask a lawyer.

If you're following a trial, serving on a jury or facing a charge yourself, the phrase "burden of proof" comes up constantly. It answers two questions: who has to prove the case, and how convincing that proof has to be.

Short answer: what is burden of proof in a criminal case? It is the prosecution's duty to prove every element of the crime beyond a reasonable doubt. The defendant is presumed innocent and does not have to prove anything. If the government falls short on any element, the verdict must be not guilty.

Two parts of the "burden"

Lawyers often split the burden of proof into two pieces:

• Burden of production. The duty to put forward enough evidence on an issue for it to be considered at all. If the prosecution cannot do this for an element, the judge can end the case before it reaches the jury.
• Burden of persuasion. The duty to convince the judge or jury to the required standard. In a criminal case, that means beyond a reasonable doubt on every element.

In criminal cases, the burden of persuasion on the elements of the crime never shifts to the defendant. A defense lawyer may raise doubts, call witnesses or say nothing at all; none of that changes the government's job.

The three main standards of proof

The Supreme Court described all three standards in Addington v. Texas (1979), a case about civil commitment.

In Addington, the Court explained that in ordinary civil cases "plaintiff's burden of proof is a mere preponderance of the evidence. The litigants thus share the risk of error in roughly equal fashion." In criminal cases, by contrast, "our society imposes almost the entire risk of error upon itself."

This difference explains why someone can be acquitted of a crime and still be found liable in a civil lawsuit about the same events.

What "reasonable doubt" means in practice

There is no single national wording. Each court gives jurors its own pattern instruction, and the Supreme Court has allowed a range of phrasings. In general terms:

• It is not proof beyond all possible or imaginary doubt.
• It is doubt based on reason and the evidence (or the lack of it), not on sympathy or speculation.
• If jurors are not firmly convinced of guilt on every element, they must acquit.

If you are on a jury, follow the exact instruction the judge gives you rather than any definition found online.

Affirmative defenses: when the defendant carries a burden

An affirmative defense admits the basic facts but offers a legal reason the defendant should not be convicted, such as insanity, duress or entrapment. Here, states and the federal system can place some burden on the defendant, as long as the prosecution still proves every element of the crime itself.

• Patterson v. New York (1977). The Supreme Court upheld a New York law requiring the defendant to prove extreme emotional disturbance by a preponderance of the evidence. Because that defense did not negate any element of murder as New York defined it, shifting the burden was constitutional.
• Federal insanity defense. Under 18 U.S.C. § 17(b), "The defendant has the burden of proving the defense of insanity by clear and convincing evidence."
• Self-defense and others. States differ. In many states, once a defendant raises self-defense with some evidence, the prosecution must disprove it beyond a reasonable doubt; in others the rules differ. Check your state's statute and jury instructions.

Other stages use lower standards

Not every step in a criminal case uses the trial standard. Arrests, search warrants and the decision to charge generally require probable cause, which is much lower. That is why a person can be arrested and charged, and the case can still end in an acquittal or a dismissal. Our guide on who the plaintiff is in a criminal case explains why the government, not the victim, carries the case.

What this means if you are charged

• You do not have to prove you are innocent. You can choose not to testify, and the jury is told not to hold that against you.
• Defense strategy often targets one element. If the prosecution cannot prove intent, identity or another single element, that can be enough. Our guide to first- vs second-degree murder shows how much turns on proving a mental state.
• Affirmative defenses can change the picture. If you raise one, ask your lawyer who must prove what, and to which standard, in your state.

Sources

• In re Winship, 397 U.S. 358 (1970) (Cornell LII)
• Addington v. Texas, 441 U.S. 418 (1979) (Cornell LII)
• Patterson v. New York, 432 U.S. 197 (1977) (Cornell LII)
• 18 U.S.C. § 17, insanity defense (Cornell LII)