Tex. Health & Safety Code § 166.036
(b) A physician, health care facility, or health care professional may not require that:
Added by Acts 1999, 76th Leg., ch. 450, Sec. 1.03, eff. Sept. 1, 1999.
Acts 2009, 81st Leg., R.S., Ch. 461 (H.B. 2585), Sec. 4, eff. September 1, 2009.