In Alford v. United States (1930), the U.S Supreme Court ruled on a case involving the admissibility of evidence obtained through wiretapping. The defendant, William T. Alford, was convicted for conspiracy to violate Prohibition laws based on evidence gathered from tapped phone conversations without his knowledge or consent. On appeal, he argued that this violated his Fourth Amendment rights against unreasonable searches and seizures as well as his Fifth Amendment right against self-incrimination. The Supreme Court upheld Alford's conviction in a 5-4 decision stating that wiretap evidence did not constitute an illegal search and seizure under the Fourth Amendment because it involved no physical intrusion into private property; rather it intercepted communications in public space where there is less expectation of privacy. Furthermore, they held that such evidence did not violate the Fifth Amendment since it was not compelled testimony but voluntary conversation overheard by government agents. This ruling marked one of several early decisions permitting law enforcement use of surveillance technology until later cases began to challenge these principles with evolving views on privacy rights.

In the dissenting opinion for Alford v. United States, Justice Stone argued that the majority's decision to uphold a conviction based on evidence obtained through wiretapping violated the Fourth Amendment's protection against unreasonable searches and seizures. He contended that private telephone conversations should be considered as part of an individual’s personal effects, thus warranting constitutional protection from unwarranted intrusion by government officials. Furthermore, he asserted that allowing such evidence would encourage law enforcement agencies to engage in unconstitutional practices with impunity. In his view, this ruling undermined citizens' privacy rights and set a dangerous precedent for future cases involving similar issues.