Five years after Akerlof's paper was published, The United States enacted a federal "lemon law" (the Magnuson-Moss Warranty Act) that protects citizens of all states. There are also state laws regarding "lemons" which vary by state and may not necessarily cover used or leased vehicles. The rights afforded to consumers by "lemon laws" may exceed the warranties expressed in purchase contracts. These state laws provide remedies to consumers for automobiles that repeatedly fail to meet certain standards of quality and performance. "Lemon law" is the common nickname for these laws, but each state has different names for the laws and acts, which may also cover more than just automobiles. In California and federal law, "Lemon Laws" cover anything mechanical.

The federal "lemon law" also provides the warrantor may be obligated to pay your attorney fees if you prevail in a lemon law suit, as do most state lemon laws. If a car has to be repaired for the same defect four or more times and the problem is still occurring, the car may be deemed to be "a lemon." The defect must substantially hinder the vehicle's use, value or safety. Purchasers who knowingly purchase a car in "as is" condition accept the defects and void their rights under the "lemon law".Criticism for this theory stems from the fact that it ignores the fact that consumers themselves can seek ways to assure the quality of a car and that a used-car salesman may work to maintain his reputation rather than pass off a "lemon". The issue of reputation, however, would not apply to private individual sellers who do not intend to sell another car in the near future. Libertarians like William L. Anderson oppose the regulatory approach proposed by the authors of the paper, observing that some used-car markets haven't broken down even without lemon legislation and that the lemon problem creates entrepreneurial opportunities for alternative marketplaces or customers' knowledgeable friends.