5.9 Presumptions are a set of assumptions that are made prior to the start of a legal process. These assumptions are not facts, but rather are based on the evidence available. They are used to helping determine the outcome of a case and in some cases, can be used to stop a case from going to trial. There are two main types of 5.9 Presumptions: Rebut table Presumptions and Irrefutable Presumptions. Rebut table Presumptions are assumptions that can be challenged or disproved by the opposing party in a case. Irrefutable Presumptions are assumptions that cannot be challenged or disproved by the opposing party.