The simple possession statute is below. As you can see, the first offense fine is enforceable by summons IF the offender provides proof of ID and gives written promise to appear in court "satisfactory to the officer." So if you don't do either of those, you're getting a ride to jail. Under subsection 2, if you're the driver of a vehicle, the penalty is different so you're likely going to jail.
41-29-139 (c)(2)(A) Marijuana and synthetic cannabinoids:
1. If thirty (30) grams or less of marijuana or ten (10) grams or less of synthetic cannabinoids, by a fine of not less than One Hundred Dollars ($100.00) nor more than Two Hundred Fifty Dollars ($250.00). The provisions of this paragraph (2)(A) may be enforceable by summons if the offender provides proof of identity satisfactory to the arresting officer and gives written promise to appear in court satisfactory to the arresting officer, as directed by the summons. A second conviction under this section within two (2) years is a misdemeanor punishable by a fine of Two Hundred Fifty Dollars ($250.00), not more than sixty (60) days in the county jail, and mandatory participation in a drug education program approved by the Division of Alcohol and Drug Abuse of the State Department of Mental Health, unless the court enters a written finding that a drug education program is inappropriate. A third or subsequent conviction under this paragraph (2)(A) within two (2) years is a misdemeanor punishable by a fine of not less than Two Hundred Fifty Dollars ($250.00) nor more than One Thousand Dollars ($1,000.00) and confinement for not more than six (6) months in the county jail.
2. Additionally, a person who is the operator of a motor vehicle, who possesses on his person or knowingly keeps or allows to be kept in a motor vehicle within the area of the vehicle normally occupied by the driver or passengers, more than one (1) gram, but not more than thirty (30) grams of marijuana or not more than ten (10) grams of synthetic cannabinoids is guilty of a misdemeanor and, upon conviction, may be fined not more than One Thousand Dollars ($1,000.00) or confined for not more than ninety (90) days in the county jail, or both.<input id="co_docMarker_2" type="hidden"> For the purposes of this subsection, such area of the vehicle shall not include the trunk of the motor vehicle or the areas not normally occupied by the driver or passengers if the vehicle is not equipped with a trunk. A utility or glove compartment shall be deemed to be within the area occupied by the driver and passengers;
