Tex. Occupations Code § 258.053: USE OF CERTAIN DRUGS.

(a) In this section, "narcotic drugs," "dangerous drugs," and "controlled substances" have the meanings defined or recognized by federal law or the law of this state.

(b) A dentist may not:

(1) prescribe, provide, obtain, order, administer, possess, dispense, give, or deliver to or for any person a narcotic drug, dangerous drug, or controlled substance:

(A) that is not necessary or required; or

(B) the use or possession of which would promote addiction to the drug or substance; or

(2) aid, abet, or cause another person to engage in an action described by Subdivision (1).

Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. Sept. 1, 1999.