In the case of Kirwan v. Murphy in 1902, the United States Supreme Court addressed a dispute over land ownership and inheritance rights. The plaintiff, Kirwan, claimed that he was entitled to certain lands based on an alleged will from his deceased relative. However, the defendant, Murphy (the executor of the estate), argued that no such will existed and therefore denied Kirwan's claim to these properties. The court ruled in favor of Murphy after examining evidence including letters written by the decedent which indicated that she did not intend for her property to be inherited by anyone outside her immediate family circle. This decision upheld lower courts' rulings denying Kirwan's claims. This case is significant as it reinforced principles regarding burden of proof in cases involving contested wills or estates - specifically emphasizing that those claiming under a supposed lost or destroyed testament must provide clear and convincing evidence supporting their assertions.

The dissenting opinion in the case of Kirwan v. Murphy argued that the majority's decision to uphold a Louisiana law requiring all butchers to slaughter their animals at a state-run facility was an infringement on individual rights and liberties. The justice believed that this law violated the 14th Amendment, which guarantees equal protection under the law, as it unfairly targeted small-scale butchers who could not afford to use these facilities. They also contended that it interfered with interstate commerce by limiting where animals could be slaughtered, thus violating Article I Section 8 of the Constitution. Furthermore, they disagreed with the majority's interpretation of police power and felt that this ruling expanded its scope beyond what was constitutionally permissible.