If you buy a defective consumer good, can you immediately reject it and get your money back?

Agency:

If you buy a consumer good (anything from a new coat to a television to a car that is intended for personal, family or household purposes) and you discover a serious defect, take it back and demand back the purchase price. You must discover the defect within a short time of purchasing it. You do not need to give them an opportunity to repair it. However, if you do not discover the defect until after you have used the item for a while, then you only have a right to a free repair, not a refund. See Maine Attorney General's Consumer Law Guide, § 5.3, Immediate Rejection of Defective Goods, § 5.6, When the Defect is not Immediately Discovered, and § 9.3, Immediate Rejection of a Used Car.