In United States v. Petit, the Supreme Court of the United States was asked to decide whether a federal statute that prohibited the sale of adulterated or misbranded food was constitutional. The defendant, Petit, had been convicted of selling adulterated and misbranded food in violation of the statute. Petit argued that the statute was unconstitutional because it was an exercise of the police power, which was reserved to the states. The Supreme Court held that the statute was constitutional. The Court reasoned that the federal government had the power to regulate interstate commerce, and that the sale of adulterated or misbranded food was an activity that affected interstate commerce. Therefore, the federal government had the power to regulate it. The Court also held that the statute was a valid exercise of the federal government's power to regulate interstate commerce, and that it did not violate the Tenth Amendment. In conclusion, the Supreme Court held that the federal statute prohibiting the sale of adulterated or misbranded food was constitutional. The Court reasoned that the federal government had the power to regulate interstate commerce, and that the sale of adulterated or misbranded food was an activity that affected interstate commerce. Therefore, the federal government had the power to regulate it.

Justice Field delivered the dissenting opinion in United States v. Petit, arguing that Congress had no authority to pass a law which allowed for the seizure of property without due process of law. He argued that this was an unconstitutional exercise of power by Congress and violated the Fifth Amendment's protection against deprivation of life, liberty or property without due process. Furthermore, he argued that it was not within Congress' power to make laws which would allow for such seizures as they were outside their enumerated powers under Article I Section 8 Clause 17 (the Necessary and Proper Clause). Justice Field concluded his dissent by stating that if such a law were upheld then it could lead to further abuses by allowing government officials too much discretion when seizing private property with impunity.