Canonum De Ius Positivum
Canons of Positive Law
VII. Law
7.11 Execution of Law
Article 308 - Jury
Canon 3277 (link)
The jury, in all suits, is the exclusive judge of the facts proved, and of the weight to be given to the testimony, except where it is provided by law that proof of any particular fact is to be taken as either conclusive or presumptive proof of the existence of another fact, or where the law directs that a certain degree of weight is to be attached to a certain species of evidence.