Tennessee Code Title 53. Food, Drugs and Cosmetics § 53-3-105

(a) SAMPLERS LICENSE AND FEE. Every person receiving or buying milk or cream on the basis of its chemical or physical constituents shall be, or have in the person's employ, in or on each milk transport tank truck, a licensed milk sampler or tester. Application to become a licensed sampler shall be made to the commissioner on forms the commissioner may prescribe. The license shall expire on July 1 of each succeeding year. In order to qualify for a license, the applicant shall satisfy to the commissioner, either by a written examination or otherwise, that the applicant is honest and competent to do sampling work. An identification card stating the applicant's name and address and bearing the same number as the applicant's license shall be issued to the applicant at the time the applicant's license is issued and shall be carried on the applicant's person at all times while on duty. The annual license fee for a sampler shall be set by rule pursuant to § 43-1-703.

(b) MILK TESTERS LICENSE AND FEE. Every person receiving or buying milk or cream on the basis of its chemical or physical constituents shall be, or have in the person's employ, a licensed milk tester to make the official analysis; and no other person shall be allowed to make the tests in any creamery, cheese factory, milk depot, milk plant, ice cream factory, cream station, milk condensery, or similar plant where milk or cream is bought or received on a basis of its chemical or physical constituents. Application to become a licensed milk tester shall be made to the commissioner on forms the commissioner may prescribe. If the applicant is found upon examination to be qualified and competent, the commissioner shall issue a license to the applicant. Licenses issued in accordance with this section shall be posted conspicuously in the tester's place of business. Licensed testers are also qualified and permitted to act as samplers. The annual license fee for a tester shall be set by rule pursuant to § 43-1-703.