Rule against Pyramiding Inferences Law and Legal Definition

Rule against pyramiding inferences is an evidentiary rule that prohibits a fact-finder from piling one inference on another to arrive at a conclusion. An inference is not reasonable if it is only a guess or a possibility, for such an inference is not based on the evidence but is pure conjecture and speculation. In short it is the legalese for exclusion of evidence having little or no probative value. At present this rule is followed by very few jurisdictions.

The true purpose of the rule against pyramiding inferences is to prevent verdicts based on mere speculation or conjecture.[Motorists Mut. Ins. Co. v. Hamilton Township Trustees, 28 Ohio St. 3d 13, 18 (Ohio 1986)]