Conn. Gen. Stat. § 53a-213b: Smoking, otherwise inhaling or ingesting cannabis as a passenger in a motor vehicle: Class D misdemeanor.

(a) A person is guilty of smoking or otherwise inhaling or ingesting cannabis, as defined in section 21a-420, in a motor vehicle when he or she smokes or otherwise inhales or ingests cannabis in a motor vehicle that is being operated by another person upon a public highway of this state or upon any road of any specially chartered municipal association or of any district organized under the provisions of chapter 105, a purpose of which is the construction and maintenance of roads and sidewalks, or in any parking area for ten cars or more, or upon any private road on which a speed limit has been established in accordance with the provisions of section 14-218a or upon any school property. No person shall be convicted of smoking or otherwise inhaling or ingesting cannabis as a passenger in a motor vehicle and possessing or having under such person's control a controlled substance upon the same transaction, but such person may be charged and prosecuted for both offenses upon the same information.

(b) Smoking or otherwise inhaling or ingesting cannabis in a motor vehicle is a class D misdemeanor.

(c) No peace officer shall stop a motor vehicle for a violation of this section if such violation is the sole reason for such stop, unless such officer (1) observes active cannabis consumption by the operator of the motor vehicle, and (2) detects the odor of burnt cannabis.