Historically, canon law has developed considerable in uence on the formation of Western legal systems. Chie y, the canonical judicial system has been the epistemological reference of modern procedural systems -common law and civil law-. We can say that the search for truth for justice in each case as a historical purpose of the canonical process is also present in secular procedural systems. However, today there is a crisis of contemporary procedural systems because they have renounced the transcendent purpose of seeking truth for the bene t of other purposes immanent character. This fact leads to various problems whose solution requires reposition the search for truth for justice of the case as essential to our procedural law.