Substantive evidence is evidence that is relevant to a material fact at issue in the case.
During a robbery trial, the prosecution seeks to admit fingerprints taken from the crime scene that match those of the defendant. This is substantive evidence, as it shows that the defendant was at the scene during the robbery.
During a bench trial for a breach of contract suit, the plaintiff seeks to prove the defendant’s alleged dishonesty by admitting into evidence audio recordings that show the defendant cheated on his wife. This is not substantive evidence, as it has no bearing on a material fact at issue in the case. The defendant’s fidelity to his wife isn’t at issue; his fidelity to the contract is.
For more detailed information, see our related Evidence terms: