In the case of Thornton et al. v. United States in 1925, the Supreme Court ruled on a matter involving prohibition laws and their enforcement. The appellants were convicted for conspiracy to violate the National Prohibition Act by transporting intoxicating liquors in Michigan, a dry state where alcohol was illegal at that time due to prohibition laws. They appealed their conviction arguing that evidence used against them had been obtained illegally through wiretapping without a warrant which violated their Fourth Amendment rights against unreasonable searches and seizures. However, the Supreme Court upheld their convictions stating that federal officers did not need warrants for wiretaps as long as they didn't physically trespass onto private property to install them; hence no constitutional violation occurred here since it involved tapping public telephone lines from outside premises owned or controlled by defendants. This ruling reflected an era when privacy rights were less stringently protected than today and before landmark cases like Katz v. United States (1967) expanded Fourth Amendment protections to include "reasonable expectation of privacy" beyond physical intrusions into personal spaces.

The dissenting opinion in the case of Thornton et al. v. United States argued that the majority's decision to uphold a conviction based on evidence obtained through warrantless searches was inconsistent with Fourth Amendment protections against unreasonable search and seizure. The dissent contended that allowing such practices would set a dangerous precedent, undermining citizens' constitutional rights and potentially leading to abuses of power by law enforcement officials. They believed that any evidence obtained without proper legal procedures should be deemed inadmissible in court, regardless of its potential relevance or impact on the outcome of a trial.