The Horowitz v. United States case in 1924 revolved around the issue of tax evasion. The petitioner, Mr. Horowitz, was charged with willfully attempting to evade and defeat his income tax for the year 1917 by filing a fraudulent return. He appealed on grounds that there was insufficient evidence to support the conviction and that he had been denied due process of law because certain evidence used against him had been obtained through an unlawful search and seizure. However, the Supreme Court ruled against Horowitz's claims stating that there was enough circumstantial evidence presented at trial to justify his conviction beyond reasonable doubt. Furthermore, it held that even if some documents were seized unlawfully from him during a raid on his office (which wasn't conclusively proven), they could still be admitted as evidence since their authenticity wasn't disputed. Therefore, this case upheld two important principles: first is regarding sufficiency of circumstantial evidences in proving guilt; second is about admissibility of potentially illegally obtained but undisputedly authentic evidences in court proceedings.

In the dissenting opinion for Horowitz v. United States, Justice McReynolds disagreed with the majority's decision to uphold a conviction based on evidence obtained through wiretapping. He argued that such practices violated Fourth Amendment protections against unreasonable searches and seizures, as well as Fifth Amendment protections against self-incrimination. The justice contended that allowing law enforcement officials to use evidence gathered in this manner would set a dangerous precedent and undermine citizens' constitutional rights. Furthermore, he expressed concern about potential abuses of power by government authorities if they were permitted to engage in unchecked surveillance activities without proper oversight or regulation.