There are two types of presumption&colon; rebuttable presumption and conclusive presumption. Violation of the statute generally raises a rebuttable presumption of negligence. A rebuttable presumption is often associated with "prima facie" evidence. There is a rebuttable presumption of unencumbered ownership. There is a rebuttable presumption that the testator is competent. Some jurisdictions may establish a rebuttable presumption of gift for property transfers between relatives. Polish Fathers want a rebuttable presumption for shared parenting in Polish law. It raised, at least, a rebuttable presumption of consideration. However, many modern cases have found merger clauses to be only a rebuttable presumption. In some cases, however, a rebuttable presumption can also work in favor of the accused. The Court thereby adopted a rebuttable presumption of reliance, based on the fraud-on-the-market theory.