It is a criminal offense to use or operate a motor vehicle, boat, airplane, motorcycle, or other motor-propelled vehicle without the consent of the owner or other person authorized to give consent. This crime is generally known as (1) unauthorized use of a motor vehicle, (2) unauthorized use of a vehicle, or (3) joyriding.

The difference between this crime and the crime of theft is that the state does not have to prove a person charged with unauthorized use of a motor vehicle intended to keep the vehicle or permanently deprive the owner of the vehicle.

Laws regarding the unauthorized use of a motor vehicle vary from state to state and are generally found in a state’s statutes—often in the penal or criminal code or the vehicle code.

In Maine, the unauthorized use of a motor vehicle, commonly referred to as 'joyriding,' is addressed under Title 29-A, Section 2410 of the Maine Revised Statutes. This statute makes it a criminal offense to use or operate a motor vehicle without the consent of the owner or the person authorized to give consent. Unlike theft, the prosecution does not need to prove that the individual intended to permanently deprive the owner of the vehicle. The focus is on the unauthorized use itself, regardless of the duration or intent to keep the vehicle. The penalties for unauthorized use of a motor vehicle in Maine can vary depending on the circumstances and the individual's criminal history, but it is generally treated as a Class D crime, which can result in fines and potential jail time. It is important for individuals charged with this offense to consult with an attorney to understand the specific implications of the charge and to receive legal representation.