The Texas Alcoholic Beverage Code - Minors §106.02
Sec. 106.02. PURCHASE OF ALCOHOL BY A MINOR
(a) A minor commits an offense if the minor purchases an alcoholic
beverage. A minor does not commit an offense if the minor purchases an
alcoholic beverage under the immediate supervision of a commissioned
peace officer engaged in enforcing the provisions of this code.
(b) An offense under this section is punishable as provided by Section 106.071.