Preponderance of the Evidence

Preponderance of the evidence is the standard of proof used in most civil cases, including asbestos lawsuits. It means the plaintiff must show that their claims are more likely true than not, often described as tipping the scales even slightly in their favor. It is a much lower standard than the "beyond a reasonable doubt" standard used in criminal trials.

Origin

The word "preponderance" comes from the Latin praeponderare, meaning "to outweigh." The standard developed in English common law as a way to resolve civil disputes where absolute certainty is impossible, and it has been the default standard in American civil litigation since the nineteenth century.

Significance in Asbestos Context

For patients and families, this is the legal yardstick the case will be measured against, and it is more achievable than many people fear. You do not need to prove with certainty that a specific company's product caused your mesothelioma or asbestosis; you need to show it is more likely than not that exposure to their asbestos was a substantial contributing cause. This is why detailed work histories, product identification, and witness recollections matter so much: each piece of evidence adds weight to your side of the scale. Defendants often try to create doubt by pointing to other possible exposures, but creating doubt is not enough to defeat a claim under this standard.

Example Sentence

The judge instructed the jury that to find for the plaintiff, they only needed to conclude that it was more likely than not, by a preponderance of the evidence, that the defendant's joint compound contributed to his mesothelioma.

Related Terms

Burden of Proof, Substantial Factor Test, Causation, Clear and Convincing Evidence, Product Identification, Liability

Notes

• Help your legal team build the strongest possible record: write down every job, jobsite, product name, brand, and co-worker you can remember, even if details feel minor.
• Preserve physical evidence when possible, old product packaging, work logs, union records, military service documents, and photographs can all add weight to your side of the scale.
• Ask your attorney how the preponderance standard applies in your state, because some jurisdictions add specific requirements for proving exposure to each named defendant's product.
• If a defendant argues that other exposures could explain your disease, your legal team doesn't have to disprove every alternative, only show that this defendant's product was more likely than not a substantial contributing cause.