Presumption of culpable mental state in prosecutions under the Act, rebuttable if accused proves absence beyond reasonable doubt. Section 22 creates a rebuttable presumption that the requisite culpable mental state exists in prosecutions under the Act; the accused may defend by proving absence of that mental state. 'Culpable mental state' includes intention, motive, knowledge, belief, or reason to believe a fact. A fact is proved only when the court believes it exists beyond reasonable doubt, not by a preponderance of probability.