United States v. Lacher was a Supreme Court case decided in 1994. The case involved a challenge to the constitutionality of a federal statute that prohibited the possession of firearms by convicted felons. The defendant, Lacher, was a convicted felon who had been found in possession of a firearm. He argued that the statute violated his Second Amendment right to bear arms. The Supreme Court held that the statute was constitutional. The Court reasoned that the Second Amendment does not guarantee an absolute right to bear arms, and that the government has a legitimate interest in preventing convicted felons from possessing firearms. The Court also noted that the statute was narrowly tailored to serve this interest, and did not unduly burden the defendant's right to bear arms. In conclusion, the Supreme Court held that the federal statute prohibiting the possession of firearms by convicted felons was constitutional. The Court reasoned that the statute was narrowly tailored to serve a legitimate government interest, and did not unduly burden the defendant's Second Amendment right to bear arms.

In the dissenting opinion of United States v. Lacher, Justice Douglas argued that the majority’s decision to uphold a conviction for possession of stolen mail was wrong because it violated the Fourth Amendment’s protection against unreasonable searches and seizures. He noted that there had been no probable cause or warrant issued prior to law enforcement officers entering Lacher's home and searching his property without permission. Furthermore, he argued that even if they did have reasonable suspicion, they still should not have entered his home without first obtaining a search warrant from a neutral magistrate as required by the Fourth Amendment. In conclusion, Justice Douglas believed that this case represented an unconstitutional violation of privacy rights and thus should be overturned in order to protect citizens from unlawful searches conducted by government agents.