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A conclusion as to the existence or nonexistence of a fact that a judge or jury must draw when certain evidence has been introduced and admitted as true in a lawsuit but that can be contradicted by evidence to the contrary.
A rebuttable presumption can be overturned only if the evidence contradicting it is true and if a reasonable person of average intelligence could logically conclude from the evidence that the presumption is no longer valid. For example, a person who has been judicially declared incompetent is presumed incompetent unless there is sufficient proof, usually in the form of medical testimony, that the person has regained competency.
n. since a presumption is an assumption of fact accepted by the court until disproved, all presumptions are rebuttable. Thus rebuttable presumption is a redundancy. (See: presumption)