Preferential Rule Law and Legal Definition

Preferential rule refers to certain principles of evidence law that prefers one kind of evidence to another. For example, a rule preferring the production of the original of a document, in preference to a copy. This can work provisionally, as when a tribunal refuses to consider one kind of evidence until better evidence is shown to be unavailable, or it may work absolutely, as when the tribunal refuses to consider anything but the better kind of evidence.