Both in common law and in civil law, a rebuttable presumption (in Latin, praesumptio iuris tantum) is an assumption made by a court that is taken to be true unless someone comes forward to contest it and prove otherwise. For example, a defendant in a criminal case is presumed innocent until proved guilty. A rebuttable presumption is often associated with prima facie evidence.
Rebuttable presumptions in criminal law are somewhat controversial in that they do effectively reverse the presumption of innocence in some cases. For example, in the United Kingdom, Section 75 of the Sexual Offences Act 2003 makes several rebuttable presumptions about mens rea and consent to sexual activity.
In some cases, however, a rebuttable presumption can also work in favor of the accused. For instance, in Australia, there is a rebuttable presumption that a child aged at least 10 but less than 14 is incapable of committing a criminal act.
An example from civil law is a rebuttable presumption for shared parenting after divorce, where the default is that child spends equal amounts of parenting time with their mother and father, with exceptions for child abuse and neglect. Such a law was enacted in Kentucky in 2018.
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