Tennessee Code Title 50. Employer and Employee § 50-9-110

(1) The laboratory is licensed and approved by the department of health, using criteria established by the United States department of health and human services as guidelines for modeling the state drug-free testing program pursuant to this section, or the laboratory is certified by the United States department of health and human services, the College of American Pathologists or other recognized authority approved by rule by the commissioner of labor and workforce development; and

(2) The laboratory complies with the procedures established by the United States department of transportation for a workplace drug test program or other recognized authority approved by the commissioner of labor and workforce development.