For purposes of this chapter and § 55-10-401, any person who drives, operates or exercises physical control of a commercial motor vehicle with a blood alcohol concentration of four hundredths of one percent (0.04%) or more commits the offense of driving while under the influence of alcohol, in violation of § 55-50-405.Acts 1937, ch. 90, § 5; impl. am. Acts 1939, ch. 205, §§ 2, 3; C. Supp. 1950, § 2715.13 (Williams, § 2715.18); Acts 1973, ch. 224, §§ 1, 2; T.C.A. (orig. ed.), § 59-706; Acts 1988, ch. 584, § 6; T.C.A., §§ 55-7-106, 55-7-408; Acts 2009, ch. 321, § 27.
Tennessee Legal Code