In the case of Pounds v. United States in 1897, the Supreme Court ruled on a matter concerning land patents and property rights. The plaintiff, Mr. Pounds, claimed ownership over a parcel of land in California based on an alleged Mexican grant that predated U.S. sovereignty over the territory following the Treaty of Guadalupe Hidalgo (1848). However, his claim was disputed by another party who held a patent from the U.S government for this same piece of land issued under an Act to ascertain and settle private land claims in California (1851). The court found that Mr. Pounds' evidence failed to establish his title conclusively as required by law; it did not meet standards set out for such cases including proof beyond reasonable doubt or clear and convincing evidence - instead being merely 'preponderant.' Therefore, he could not successfully challenge or nullify the other party's patent granted by federal authority which had followed due process according to established laws at that time.

In the dissenting opinion for Pounds v. United States, Justice Harlan argued that the majority's decision to uphold a conviction based on evidence obtained through an unlawful search and seizure was in violation of constitutional rights. He contended that such actions by law enforcement were not only illegal but also undermined the principles of liberty and privacy upon which American democracy is founded. Harlan asserted that allowing illegally obtained evidence to be used in court would set a dangerous precedent, essentially giving law enforcement agencies free rein to violate citizens' Fourth Amendment rights without consequence. He further suggested this could lead to widespread abuse of power, as officers might feel emboldened by their newfound ability to conduct searches and seizures with impunity. Ultimately, he concluded his dissent by reiterating his belief that any evidence procured through unconstitutional means should be deemed inadmissible in court.