In Knapp v. Homeopathic Mutual Life Insurance Company, the Supreme Court of the United States was asked to decide whether a life insurance policy was valid when the insured had made a false statement in the application. The insured, Knapp, had applied for a life insurance policy with Homeopathic Mutual Life Insurance Company. In the application, Knapp had stated that he was in good health, when in fact he was suffering from a serious heart condition. After Knapp's death, his widow attempted to collect on the policy, but the insurance company refused to pay, citing the false statement in the application. The Supreme Court held that the insurance company was not liable to pay the policy, as the false statement was material to the risk assumed by the insurance company. The Court noted that the insurance company had relied on the statement in the application when deciding to issue the policy, and that the false statement had induced the company to accept a greater risk than it would have otherwise. The Court also noted that the insured had not acted in good faith, as he had knowingly made a false statement in the application. As such, the Court held that the insurance company was not liable to pay the policy.

Justice Field delivered the dissenting opinion in Knapp v. Homeopathic Mutual Life Insurance Company, arguing that the majority's decision was contrary to established precedent and would have a detrimental effect on insurance companies' ability to manage their own affairs. He argued that it had long been accepted law that an insurer could not be held liable for failing to pay benefits unless there was proof of fraud or bad faith on its part, which he did not believe existed in this case. Furthermore, he noted that if insurers were required to pay out claims even when they lacked sufficient evidence of death or disability, then they would be unable to properly assess risk and set premiums accordingly - thus leading them into financial ruin. In conclusion, Justice Field believed the Court should adhere strictly to existing legal principles rather than creating new ones based upon what it deemed "equitable" considerations.