Texas Penal Code - PENAL § 49.02. Public Intoxication

(a) A person commits an offense if the person appears in a public place while intoxicated to the degree that the person may endanger the person or another.

(a-1) For the purposes of this section, a premises licensed or permitted under the Alcoholic Beverage Code is a public place.

(b) It is a defense to prosecution under this section that the alcohol or other substance was administered for therapeutic purposes and as a part of the person's professional medical treatment by a licensed physician.

(c) Except as provided by Subsection (e), an offense under this section is a Class C misdemeanor.

(d) An offense under this section is not a lesser included offense under Section 49.04.

(e) An offense under this section committed by a person younger than 21 years of age is punishable in the same manner as if the minor committed an offense to which Section 106.071, Alcoholic Beverage Code, applies.