United States v. Phillips was a United States Supreme Court case that addressed the issue of whether a defendant could be convicted of a crime if the evidence presented at trial was obtained through an illegal search and seizure. The Court held that the evidence was admissible and that the defendant could be convicted. The case involved a defendant, Phillips, who was charged with the possession of counterfeit money. The evidence used to convict him was obtained through a search and seizure that was conducted without a warrant. The defendant argued that the evidence should be excluded because it was obtained illegally. The Supreme Court disagreed and held that the evidence was admissible and that the defendant could be convicted. The Court reasoned that the Fourth Amendment does not require the exclusion of evidence obtained through an illegal search and seizure. The Court noted that the exclusionary rule is a judicially created remedy and that it should not be applied in a manner that would defeat the public interest in the enforcement of criminal laws. The Court concluded that the evidence was admissible and that the defendant could be convicted.

In United States v. Phillips, the Supreme Court was tasked with determining whether a federal statute that prohibited the sale of adulterated food and drugs applied to an individual who had sold misbranded oleomargarine in interstate commerce. The majority opinion held that it did apply, but Justice Field dissented on the basis that Congress lacked authority under the Constitution to regulate such activities. He argued that while Congress could pass laws regulating foreign and interstate commerce, they were limited by their power over those areas only; any attempt to extend beyond this would be unconstitutional as it exceeded its delegated powers from the states or people. Furthermore, he noted that if Congress was allowed to regulate matters like these then there would be no limit on what they could do since anything related to trade between states or countries could fall within their purview. In conclusion, Justice Field believed that allowing such broad regulation by Congress violated both state sovereignty and personal liberty rights guaranteed by the Constitution