In the case of Lyon v. Mutual Benefit Health & Accident Association, 1938, the U.S Supreme Court ruled in favor of Mrs. Lyon who had filed a claim against her insurance company for failing to pay out benefits following her husband's death. The insurer argued that Mr. Lyon's policy was void because he had misrepresented his health condition during application by not disclosing a pre-existing heart disease which led to his death later on. However, it was found that at the time of applying for insurance coverage, Mr.Lyon did not know about this condition and hence could not have disclosed it intentionally or unintentionally as required by law under "warranty" provisions in such contracts . Therefore, there was no misrepresentation on part of insured and thus court held that insurer must honor its contractual obligations towards beneficiary i.e., Mrs.Lyon.

In the dissenting opinion for Lyon v. Mutual Benefit Health & Accident Association, the justice argued that there was no legal basis to support a ruling in favor of the plaintiff. The justice contended that the insurance policy contract between Mr. Lyon and Mutual Benefit Health & Accident Association clearly stipulated certain conditions under which benefits would be paid out, including an explicit requirement for total disability caused by bodily injuries or disease. In this case, it was evident from medical testimony that Mr. Lyon's condition did not meet these criteria as his inability to work resulted primarily from old age rather than any specific injury or illness covered by his policy terms. Therefore, according to contractual law principles and given the clear language of exclusion within Mr.Lyon’s insurance agreement itself, he should not have been entitled to receive benefits payments from Mutual Benefit Health & Accident Association.