In the United States v. Green case of 1901, the Supreme Court ruled on a matter involving land ownership and mining rights in Colorado. The dispute arose when both parties claimed ownership over a valuable piece of land rich with mineral deposits. The plaintiff, the U.S government, argued that it retained ownership because the defendant had not complied with federal laws regarding mining claims at the time he acquired his title to this property. On appeal from lower courts' rulings favoring Mr.Green's claim, Justice Harlan delivered an opinion for a unanimous court upholding those decisions. The Supreme Court found that while there were technical irregularities in how Mr.Green obtained his title initially (he did not fully comply with all requirements set out by law), these issues were minor and didn't invalidate his claim to own this land outright under 'color of title'. This term refers to circumstances where someone owns property based on some legal document or claim which appears valid but may be flawed legally. This decision reinforced principles around color of title doctrine and clarified its application within context of federal mining laws - emphasizing substance over formality when assessing validity of such claims.

In the dissenting opinion for United States v. Green, the justice argued that the majority's decision to uphold a conviction based on evidence obtained through an unlawful search and seizure was in violation of Fourth Amendment rights. The justice contended that any evidence procured by such means should be deemed inadmissible in court as it infringes upon an individual's constitutional right to privacy and protection against unreasonable searches and seizures. Furthermore, he expressed concern over setting a dangerous precedent where law enforcement could potentially exploit this ruling to justify future violations of citizens' Fourth Amendment rights under the guise of gathering evidence for criminal prosecutions. He emphasized that upholding constitutional principles should take precedence over securing convictions at all costs.