Tex. Occ. Code § 107.053
A hospital or other health care facility may not prohibit or restrict the use of a dangerous drug or controlled substance prescribed or administered by a physician who holds staff privileges at the hospital or facility for a person diagnosed and treated by a physician for intractable pain.
Added by Acts 2003, 78th Leg., ch. 1276, Sec. 14.002(a), eff. Sept. 1, 2003.