Presumption of culpable mental state

(1) In any prosecution for an offence under this Act which requires a culpable mental state of the accused, the court shall presume the existence of such mental state but it shall be a defence for the accused to prove the fact that he had no such mental state with respect to the act charged as an offence in that prosecution.

(2) For the purpose of this section , a fact is said to be proved only when the court believes it to exist beyond a reasonable doubt and not merely when its existence is established by a preponderance of probability.