Tex. Occ. Code § 702.155
A certificate holder shall maintain the security filed or posted under Section 702.151 in effect until the earlier of:
Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. Sept. 1, 1999.
Acts 2011, 82nd Leg., R.S., Ch. 1340 (S.B. 1231), Sec. 1, eff. September 1, 2011.