Tex. Government Code § 811.005: EXEMPTION FROM EXECUTION.

All retirement annuity payments, optional benefit payments, member contributions, money in the various retirement system funds, and rights accrued or accruing under this subtitle to any person are exempt from garnishment, attachment, state and local taxation, levies, sales, and any other process, and are unassignable except as provided by Section 813.103.

Acts 1981, 67th Leg., p. 1876, ch. 453, Sec. 1, eff. Sept. 1, 1981. Renumbered from Vernon's Ann.Civ.St. Title 110B, Sec. 21.005 and amended by Acts 1989, 71st Leg., ch. 179, Sec. 1, eff. Sept. 1, 1989.