45-6-308. Unauthorized use of motor vehicles. (1) A person commits the offense of unauthorized use of motor vehicles if the person knowingly operates the automobile, airplane, motorcycle, quadricycle, motorboat, or other motor-propelled vehicle of another without the other's consent.

(2) A person convicted of unauthorized use of motor vehicles shall be fined not to exceed $500 or be imprisoned in the county jail for any term not to exceed 6 months, or both. It is an affirmative defense that the offender reasonably believed that the owner would have consented to the operation had the owner known of it.