Substantial-Evidence Rule Law and Legal Definition

Substantial evidence rule is a principle that a reviewing court should uphold an administrative body's ruling if it is supported by evidence on which the administrative body could reasonably base its decision.

The following is an example of a caselaw on the rule:

Substantial, within the meaning of the substantial evidence rule, means that the evidence must be of ponderable legal significance. It does not mean simply any evidence. It must be reasonable in nature, credible, and of solid value; it must actually be substantial proof of the essentials that the law requires in a particular case. [In re Alcala, 222 Cal. App. 3d 345 (Cal. App. 1st Dist. 1990)]