� 20-12.1. Impaired supervision or instruction.
(a)It is unlawful for a person to serve as a supervising driver under G.S. 20-7(l) or G.S. 20-11 or as an approved instructor under G.S. 20-7(m) in any of the following circumstances:

(1) While under the influence of an impairing substance.
(2) After having consumed sufficient alcohol to have, at any relevant time after the driving, an alcohol concentration of 0.08 or more.

(b) An offense under this section is an implied-consent offense under G.S. 20-16.2. (1977, c. 116, ss. 1, 2; 1981, c. 412, s. 4; c. 747, s. 66; 1983, c. 435, s. 9; 1993, c. 285, s. 2; 1997-16, s. 7.)

� 20-138.1. Impaired driving.
(a)Offense. - A person commits the offense of impaired driving if he drives any vehicle upon any highway, any street, or any public vehicular area within this State: (1) While under the influence of an impairing substance; or
(2) After having consumed sufficient alcohol that he has, at any relevant time after the driving, an alcohol concentration of 0.08 or more.

(b) Defense Precluded. - The fact that a person charged with violating this section is or has been legally entitled to use alcohol or a drug is not a defense to a charge under this section.

(c) Pleading. - In any prosecution for impaired driving, the pleading is sufficient if it states the time and place of the alleged offense in the usual form and charges that the defendant drove a vehicle on a highway or public vehicular area while subject to an impairing substance.

(d) Sentencing Hearing and Punishment. - Impaired driving as defined in this section is a misdemeanor. Upon conviction of a defendant of impaired driving, the presiding judge must hold a sentencing hearing and impose punishment in accordance with G.S. 20-179.

(e) Exception. - Notwithstanding the definition of "vehicle" pursuant to G.S. 20-4.01(49), for purposes of this section the word "vehicle" does not include a horse, bicycle, or lawnmower. (1983, c. 435, s. 24; 1989, c. 711, s. 2; 1993, c. 285, s. 1.)

� 20-138.2. Impaired driving in commercial vehicle.
(a)Offense. - A person commits the offense of impaired driving in a commercial motor vehicle if he drives a commercial motor vehicle upon any highway, any street, or any public vehicular area within the State:

(1) While under the influence of an impairing substance; or
(2) After having consumed sufficient alcohol that he has, at any relevant time after the driving, an alcohol concentration of 0.04 or more.

(b) Defense Precluded. - The fact that a person charged with violating this section is or has been legally entitled to use alcohol or a drug is not a defense to a charge under this section.

(c) Pleading. - To charge a violation of this section, the pleading is sufficient if it states the time and place of the alleged offense in the usual form and charges the defendant drove a commercial motor vehicle on a highway, street, or public vehicular area while subject to an impairing substance.

(d) Implied Consent Offense. - An offense under this section is an implied consent offense subject to the provisions of G.S. 20-16.2.

(e) Punishment. - The offense in this section is a misdemeanor and any defendant convicted under this section shall be sentenced under G.S. 20-179. This offense is not a lesser included offense of impaired driving under G.S. 20-138.1, and if a person is convicted under this section and of an offense involving impaired driving under G.S. 20-138.1 arising out of the same transaction, the aggregate punishment imposed by the Court may not exceed the maximum punishment applicable to the offense involving impaired driving under G.S. 20-138.1. (f) Repealed by Session Laws 1991, c. 726, s. 19.

(g) Chemical Analysis Provisions. - The provisions of G.S. 20- 139.1 shall apply to the offense of impaired driving in a commercial motor vehicle. (1989, c. 771, s. 12; 1991, c. 726, s. 19; 1993, c. 539, s. 363; 1994, Ex. Sess., c. 24, s. 14(c); 1998- 182, s. 24.)