Michigan Compiled Laws, Chapter 333. Health § 333.26424b

Sec. 4b. (1) Except as provided in subsections (2) to (4), a qualifying patient or primary caregiver shall not transport or possess a marihuana-infused product in or upon a motor vehicle.

(2) This section does not prohibit a qualifying patient from transporting or possessing a marihuana-infused product in or upon a motor vehicle if the marihuana-infused product is in a sealed and labeled package that is carried in the trunk of the vehicle or, if the vehicle does not have a trunk, is carried so as not to be readily accessible from the interior of the vehicle. The label must state the weight of the marihuana-infused product in ounces, name of the manufacturer, date of manufacture, name of the person from whom the marihuana-infused product was received, and date of receipt.

(3) This section does not prohibit a primary caregiver from transporting or possessing a marihuana-infused product in or upon a motor vehicle if the marihuana-infused product is accompanied by an accurate marihuana transportation manifest and enclosed in a case carried in the trunk of the vehicle or, if the vehicle does not have a trunk, is enclosed in a case and carried so as not to be readily accessible from the interior of the vehicle. The manifest form must state the weight of each marihuana-infused product in ounces, name and address of the manufacturer, date of manufacture, destination name and address, date and time of departure, estimated date and time of arrival, and, if applicable, name and address of the person from whom the product was received and date of receipt.

(4) This section does not prohibit a primary caregiver from transporting or possessing a marihuana-infused product in or upon a motor vehicle for the use of his or her child, spouse, or parent who is a qualifying patient if the marihuana-infused product is in a sealed and labeled package that is carried in the trunk of the vehicle or, if the vehicle does not have a trunk, is carried so as not to be readily accessible from the interior of the vehicle. The label must state the weight of the marihuana-infused product in ounces, name of the manufacturer, date of manufacture, name of the qualifying patient, and, if applicable, name of the person from whom the marihuana-infused product was received and date of receipt.

(5) For purposes of determining compliance with quantity limitations under section 4,  1 there is a rebuttable presumption that the weight of a marihuana-infused product listed on its package label or on a marihuana transportation manifest is accurate.

(6) A qualifying patient or primary caregiver who violates this section is responsible for a civil fine of not more than $250.00.