Canonum De Ius Positivum
Canons of Positive Law
I. Introductory Provisions
1.2 Concepts
Article 14 - Proof
Canon 1481 (link)
As these canons of Divine Law, Natural Law, Cognitive Law and Positive Law comprehensively prove Divine Law, Natural Law and Positive Law, they stand as the highest proof of law against any other claims of inferior law.