In the 1932 case of Sgro v. United States, the Supreme Court ruled on a matter concerning prohibition laws and illegal alcohol production. The defendant, Joseph Sgro, was convicted for possessing a still to manufacture liquor illegally during Prohibition in violation of federal law. On appeal, he argued that evidence against him had been obtained through an unlawful search and seizure by police officers who did not have a warrant at the time they found his illicit operation. However, the Supreme Court upheld his conviction with Justice George Sutherland writing for majority opinion stating that while Fourth Amendment rights are important protections against unreasonable searches and seizures; however when it comes to movable vehicles like automobiles or boats where there is probable cause to believe they contain contraband items such as illegal alcohol equipment or products then immediate action may be necessary without obtaining prior judicial approval via warrant due to their inherent mobility which could result in loss of evidence if delayed by procedural requirements.

In the dissenting opinion for SGRO v. UNITED STATES, Justice McReynolds disagreed with the majority's decision to uphold Sgro's conviction. He argued that there was insufficient evidence to prove beyond a reasonable doubt that Sgro had knowingly and intentionally violated the National Prohibition Act by possessing alcohol. According to Justice McReynolds, mere possession of liquor does not necessarily imply intent to sell or distribute it illegally; other explanations could exist such as personal consumption or medicinal use. Furthermore, he contended that if Congress intended for simple possession of alcohol to be a crime under this act, they would have explicitly stated so in clear terms within the legislation itself rather than leaving it up for interpretation by courts.