What is Evidence-based Legislation?

Legal Definition
Evidence-based legislation (EBL) calls for the use of the best available scientific evidence and systematically collected data, when available, by legislatures as a basis for their formulation and writing of law. Drawn from the definition of "evidence-based medicine" which is "the conscientious, explicit, and judicious use of current best evidence in making decisions about the care of individual patients" [1], this concept calls upon legislative bodies to inform their legislation with the best available scientific and systematically collected evidence available.
-- Wikipedia