Tenn. Code Ann. § 57-3-412 says:
It is unlawful for any person under the age of twenty-one (21) years to have in such person’s possession or to consume any intoxicating liquor or beer for any purpose, whether the same be possessed or consumed in a dry county or a wet county. It is unlawful for any person under twenty-one (21) years of age to transport any intoxicating liquor or beer for any purpose, whether the same be transported in a dry or wet county; provided, that this section shall not be construed as prohibiting any person eighteen (18) years of age or older from transporting, possessing, selling or dispensing intoxicating liquor or beer in the course of such person’s employment. For purposes of this subdivision (a)(3), “beer” shall have the same meaning as provided in § 57-6-102.