Constitution of the State of California 1879 Art. XII, § 7

Sec. 7.  A transportation company may not grant free passes or discounts to anyone holding an office in this state;  and the acceptance of a pass or discount by a public officer, other than a Public Utilities Commissioner, shall work a forfeiture of that office.  A Public Utilities Commissioner may not hold an official relation to nor have a financial interest in a person or corporation subject to regulation by the commission.