Tennessee Code Title 53. Food, Drugs and Cosmetics § 53-14-102

(1) A licensed physician, dentist or veterinarian lawfully administering, dispensing or prescribing a legend drug or controlled substance in the course of the individual's professional practice to an ultimate user for a recognized medical purpose; or

(2) A manufacturer or distributor whose research protocol has been approved by the federal food and drug administration under that agency's auspices, or otherwise subject to jurisdiction of the federal food and drug administration and if lawful under that jurisdiction.