Section 20-136 - Smoke screens(a) It shall be unlawful for any person or persons to drive, operate, equip or be in the possession of any automobile or other motor vehicle containing, or in any manner provided with, a mechanical machine or device designed, used or capable of being used for the purpose of discharging, creating or causing, in any manner, to be discharged or emitted, either from itself or from the automobile or other motor vehicle to which attached, any unusual amount of smoke, gas or other substance not necessary to the actual propulsion, care and keep of said vehicle, and the possession by any person or persons of any such device, whether the same is attached to any such motor vehicle, or detached therefrom, shall be prima facie evidence of the guilt of such person or persons of a violation of this section.(b) Any person or persons violating the provisions of this section shall be guilty of a Class I felony. 1937, c. 407, s.99; 1993, c. 539, s. 1257; 1994, Ex. Sess., c. 24, s. 14 (c) .