Tex. Government Code § 821.005: EXEMPTION FROM EXECUTION.

All retirement allowances, annuities, refunded contributions, optional benefits, money in the various retirement system accounts, and rights accrued or accruing under this subtitle to any person are exempt from garnishment, attachment, state and municipal taxation, sale, levy, and any other process, and are unassignable.

Acts 1981, 67th Leg., p. 1876, ch. 453, Sec. 1, eff. Sept. 1, 1981. Renumbered from Vernon's Ann.Civ.St. Title 110B, Sec. 31.005 by Acts 1989, 71st Leg., ch. 179, Sec. 1, eff. Sept. 1, 1989.