Tex. Natural Resources Code § 161.177: PURCHASE AND DESTRUCTION OF BONDS.

(a) The board may use money in the fund to purchase on the open market any bonds it has issued and sold, and the debt represented by these bonds when purchased is considered canceled.

(b) Bonds purchased by the board under Subsection (a) of this section shall be mutilated, burned, or otherwise destroyed by the comptroller, who shall certify this fact to the board under the seal of his office.

(c) No further interest shall be paid on these bonds.

Acts 1977, 65th Leg., p. 2664, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977. Amended by Acts 1997, 75th Leg., ch. 1423, Sec. 14.19, eff. Sept. 1, 1997.