Maryland’s Lemon Law does not apply to used cars. Maryland law does require the seller of a used car to present the buyer with a Maryland Safety Inspection Certificate, which is valid for 90 days. However, a used car can be sold “as is” if it is more than six years old and has more than 60,000 miles. All other used cards sold by a dealer come with an implied warranty that the car will function for a reasonable period of time.