What Is the Burden of Proof In a Criminal Case?

In any court case, the “burden of proof” refers to the prosecution’s or plaintiff’s requirement to present enough evidence to prove the defendant’s guilt or liability in the case. In a criminal case, the prosecution has the burden of proving the defendant’s guilt beyond a reasonable doubt.

All criminal cases use the reasonable doubt standard. This is the highest standard of proof required in criminal law. This legal standard protects the defendant’s presumption of innocence by creating a high bar for the jury and prosecution to clear before declaring a defendant guilty.

Beyond a Reasonable Doubt

The phrase “beyond a reasonable doubt” does not mean “beyond all doubt.” The standard is sometimes described informally as “99% certainty” or “firmly convinced of the defendant’s guilt.” Reasonable doubt means there is no other logical explanation for the offense than the one offered by the prosecution. Another way to define it is by comparison to other standards of proof. Reasonable doubt is higher than:

• Clear and convincing evidence​, an intermediate standard of evidence, used in constitutional rights cases and some cases of fraud or appellate cases.

• Preponderance of the evidence​. The lowest evidentiary standard, used in most civil cases, it means “more likely than not,” and requires proving a case to about 51% certainty.

Civil cases use lower standards because the state does not bring charges against the defendant. Civil cases involve private parties. The outcome of the case will be money damages or injunctive relief. Beyond a reasonable doubt is the highest level of proof required. Prosecutors must present evidence to overcome any reasonable challenges to the defendant’s guilt. Since the defendant is at risk of losing their liberty, or even their life, trials need the highest standard of evidence.

The Prosecution’s Burden of Production

The prosecution must present all evidence​ to support the case. A criminal defendant does not need to produce any evidence in support of their guilt or innocence, although they may choose to do so. The prosecution must have sufficient evidence to prove its case even before the trial begins.

The prosecution must prove each element of the crime charged beyond a reasonable doubt. For example, in a theft case, the prosecution must prove that the defendant took property, that the property belonged to another person, and that the defendant intended to permanently deprive the owner of that property.

The government’s responsibility breaks down into two main “burdens”:

• Burden of production: The prosecutor must have enough evidence to bring criminal charges before the case may proceed. In federal felony cases and in some states, a grand jury​ must review the prosecution’s evidence before issuing an indictment. Grand jury requirements vary by state, with approximately half of states requiring them for felony cases.

• Burden of persuasion: The prosecutor must convince the factfinder (judge or jury) that this evidence points to the defendant’s guilt in the case. A criminal prosecution must show an unbroken chain between each piece of evidence to the defendant.

Only after the prosecution presents its case in chief does the burden switch to the defendant to present any evidence to counter or rebut the prosecution’s case. The prosecution must prove the defendant’s guilt. The defendant does not need to prove their innocence. However, if the defendant raises an affirmative defense (such as self-defense or insanity), they may need to present some evidence supporting that defense.

Burden of Proof in a Criminal Trial

“Beyond a reasonable doubt” does not mean “beyond all doubt.” It means, as it says, that the prosecution must address any ordinary, reasonable questions. Federal jury instructions for the Ninth Circuit Court of Appeals​ explain that “Proof beyond a reasonable doubt is proof that leaves you firmly convinced the defendant is guilty. It is not required that the government prove guilt beyond all possible doubt. A reasonable doubt is a doubt based upon reason and common sense and is not based purely on speculation. It may arise from a careful and impartial consideration of all the evidence, or from lack of evidence.”

Myths and Facts of Burden of Proof

There may always be some doubt. Circumstantial evidence​ is sometimes considered less persuasive than eyewitness testimony by jurors. However, in the legal system, circumstantial evidence such as fingerprints and DNA can be highly reliable—often more so than eyewitness testimony, which research shows can be unreliable. If circumstantial evidence is not presented correctly, jurors may be uncomfortable about voting guilty.

Defense strategies may focus on weaknesses in the prosecution’s case, creating “reasonable suspicion” for the trier of fact to examine. A famous example occurred in the O.J. Simpson murder trial. The defense team questioned the law enforcement officers’ handling of evidence collected at the scene. This created reasonable doubt about whether the blood found at the scene and the blood at Simpson’s residence met the chain of custody standard.

“Beyond a reasonable doubt” does not mean beyond all doubt. Unless a defendant confesses (and sometimes when they do), there may be some question about whether they committed a crime. However, jurors and other triers of fact must be realistic in their assessment. The prosecutor does not need to exclude space aliens, time travelers, or evil twins as possible co-defendants.

Defense lawyers may concentrate on minute details in an otherwise solid prosecution to create reasonable doubt for their client. Another example from the O.J. Simpson case involved the “satellite trial” of prosecution witness Mark Fuhrman. Fuhrman was accused of racism and using racist language during his law enforcement career. This allegation had no relationship to whether Simpson did or did not murder the victims, but it raised doubt about his validity as a witness. The legal issues caused enough confusion to create doubt in the jury’s mind.

Importance of the Burden of Proof Standard

Blackstone’s Ratio is a legal formulation often quoted by lawyers, judges, and legal scholars. William Blackstone was an English jurist and scholar in the 1760s who wrote extensively on British law. He wrote that “It is better that 10 guilty men go free than that one innocent man be wrongfully punished.” Benjamin Franklin increased the ratio to a hundred guilty persons.

The U.S. justice system requires that all defendants be presumed innocent. This does not mean they are free of guilt at trial, but rather that the state must prove their guilt with sufficient evidence to overcome all constitutional protections. The United States adopted this system because, at one time, defendants had to prove their innocence to the King.

Get Legal Advice from a Criminal Defense Attorney

In any criminal trial, defendants must cope with pretrial hearings, evidence collection, and keeping their lives on track. Having help from a criminal defense attorney​ is not only essential, but it is also one of your constitutional rights. After an arrest, you should ask for legal representation as soon as possible.