Except as otherwise herein provided, no trustee and no employee of the board of trustees shall have any direct interest in the gains or profits of any investment made by the board of trustees, nor as such receive any pay or emolument for his service. No trustee or employee of the board shall directly or indirectly for himself or as an agent in any manner use the same, except to make such current and necessary payments as are authorized by the board of trustees upon proper vouchers to the state treasurer, nor shall any trustee or employee of the board of trustees become an indorser or surety or in any manner an obligor for moneys loaned to or borrowed from the board of trustees.
T.C.A. § 49-1507