Rules of evidence.

(1) In all proceedings before the commission or the courts, civil or criminal, in which the payment, receipt, or expectation of a commission, compensation, or a valuable consideration is a necessary element of the offense, proof of the performance of the act, service, or condition for which such commission, compensation, or valuable consideration is required to be shown shall be prima facie evidence that such act, service, or condition was performed or existed for or in expectation of the payment or receipt of a commission, compensation, or a valuable consideration. If it is material to determine whether or not a party to any action, civil or criminal, is properly licensed, the burden of proof shall be on such party.

(2) Photostatic copies of any papers or documents may be introduced in lieu of the originals in any proceeding or prosecution under this chapter. The books of account and records of any person shall be admissible upon a showing that they were made in the regular course of business, without introducing the person who made the entries, the weight of such evidence to be decided by the court or commission.