Sec. 151.505.  WHEN DETERMINATION BECOMES FINAL.  A determination made under Section 151.501, 151.503, or 151.504 of this code becomes final on the expiration of 30 days after the day on which the determination was served by personal service or by mail, unless a petition for a redetermination is filed before the determination becomes final.
Acts 1981, 67th Leg., p. 1577, ch. 389, Sec. 1, eff. Jan. 1, 1982.