Culpable mental state presumption requires accused to prove absence of mens rea in criminal proceedings as a defence. The statute presumes the existence of a culpable mental state in prosecutions requiring such a state, while allowing the accused a defence of proving absence of that mental state; 'culpable mental state' includes intention, motive, knowledge, and belief or reason to believe a fact, and proof of a fact requires belief beyond reasonable doubt rather than a preponderance of probability.