Burden of Proof

The burden of proof refers to the legal obligation of a party to produce sufficient evidence to establish the truth of their claims. In personal injury civil litigation, the burden of proof rests on the plaintiff — the party bringing the lawsuit — to prove each element of their claim. The standard of proof in civil cases, including personal injury lawsuits, is preponderance of the evidence, meaning the plaintiff must show that it is more likely than not — greater than a 50 percent probability — that the facts they assert are true.

The preponderance of evidence standard is often described as tipping the scales in the plaintiff's favor. This contrasts sharply with the criminal law standard of beyond a reasonable doubt, which requires a much higher degree of certainty and is designed to protect innocent defendants from unjust conviction. The lower civil standard reflects the fact that personal injury cases involve private disputes between individuals rather than the full power of the state being brought against an individual.

Different claims within a personal injury lawsuit may have different burdens of proof. For example, if the defendant raises an affirmative defense such as contributory negligence or assumption of risk, the defendant typically bears the burden of proving that defense. Similarly, in cases seeking punitive damages, courts often require clear and convincing evidence — a standard higher than preponderance but lower than beyond a reasonable doubt — to justify an award of punitive damages.

Practically speaking, the burden of proof shapes every aspect of how a personal injury case is prepared and presented. Attorneys gather evidence, retain expert witnesses, and structure arguments with the goal of satisfying the plaintiff's burden of proof on each element of the claim. When a plaintiff fails to meet their burden on any essential element, the court may grant summary judgment in the defendant's favor or direct a verdict in the defendant's favor at trial, ending the case without a jury decision.