Rule 13

(A) A presumption is a deduction of fact the law authorizes or requires to be made from another fact or group of facts previously established in the action. Said previously established fact or group of facts are called basic fact; the fact deduced by presumption is called the presumed fact.(B) A presumption is conclusive when the law does not allow the introduction of evidence to destroy or rebut the presumption, that is, to show the nonexistence of the presumed fact. All other presumptions are rebuttable.(C) This chapter only refers to rebuttable presumptions.