Every element of a test must be proven by someone, to some level of certainty. Those are two different questions: who must prove it, and how sure the factfinder must be. You met the two main standards in civil and criminal cases.
Key idea
The burden of proof says which party must prove a point. It has two parts: the burden of production (offering enough evidence to put the issue in play) and the burden of persuasion (convincing the factfinder). The standard says how sure the factfinder must be: a preponderance of the evidence (more likely than not), clear and convincing evidence, or beyond a reasonable doubt.
| Standard | Meaning | Typical use |
|---|---|---|
| Preponderance of the evidence | more likely true than not (just over 50 percent) | most civil cases |
| Clear and convincing evidence | highly probable; well above a preponderance | some civil matters, such as fraud claims in many states, involuntary commitment, and defamation of a public figure (for actual malice) |
| Beyond a reasonable doubt | no reasonable doubt of guilt remains; the highest standard | every element of a crime (In re Winship, 1970) |
Why it works
The burden decides close cases: if the evidence is evenly balanced, the party with the burden of persuasion loses. That is why who bears it matters so much. The standard reflects how costly each kind of error is. In an ordinary civil case, a wrong verdict for either side is about equally bad, so the law asks only which account is more likely. Where liberty or reputation is at stake, the law accepts more wrong acquittals to avoid wrong convictions, so it raises the bar. Courts avoid putting numbers on the higher standards; "50 percent" is only a way to explain the preponderance tie-breaker.
Worked example: A tie
In a civil case, the jury thinks the plaintiff's and the defendant's versions are exactly equally likely. Who wins?
- The plaintiff bears the burden of persuasion on her claim.
- Preponderance requires her version to be more likely than not.
- A tie is not more likely than not.
Answer: The defendant wins.
Worked example: Same evidence, different results
A jury believes it is about 70 percent likely that Drew caused a fire on purpose. What results in (1) a criminal arson trial and (2) a civil suit by the building owner?
- (1) Seventy percent leaves a real doubt; that is not proof beyond a reasonable doubt. Acquittal.
- (2) Seventy percent is more likely than not. The owner wins.
Answer: (1) not guilty; (2) liable.
Common mistake
Thinking "preponderance" means a large majority of the evidence, or more witnesses. It means more likely true than not, even by a slight margin, and it is about the convincing force of the evidence, not its amount. One believable witness can outweigh three who are not. Check: would the factfinder say "more likely than not"? Then the preponderance standard is met.
This is an educational course, not legal advice.