Incontrovertible evidence
Incontrovertible evidence, or conclusive evidence, is a colloquial term for evidence introduced to prove a fact that is supposed to be so conclusive that there can be no other truth to the matter; evidence so strong it overpowers contrary evidence, directing a fact-finder to a specific and certain conclusion. For example, a DNA test is conclusive of parenthood, a CCTV camera footage of a crime taking place is conclusive, as is a contract showing an agreement.