Sec. 21.017.  EVIDENCE OF VALIDITY.  In an action to enforce collection of the bonds or rights incident to the bonds, the certificate of approval by the attorney general and a certificate of registration by the comptroller, or certified copies of these certificates, shall be received in evidence as proof of the validity of the bonds.
Acts 1975, 64th Leg., p. 1405, ch. 545, Sec. 1, eff. Sept. 1, 1975.