304 U.S. 144 (1938)
The United States v. Carolene Products Co.
Whether the statute banning the shipment of 'filled milk' in interstate commerce violated the Constitution on grounds of it being an arbitrary and unreasonable exercise of congressional power under the Fifth Amendment.
Economic regulations challenged under the Due Process Clause are upheld if they are rationally related to a legitimate government interest.
The Supreme Court held that the Act prohibiting the interstate shipment of 'filled milk' did not violate the Constitution. The decision confirmed that the rational basis standard applied to economic regulation was satisfied.
This case is significant for its introduction of the rational basis test, which became a cornerstone of constitutional analysis of economic regulation. The decision shifted judicial philosophy to a more deferential stance towards Congress concerning economic regulation, reaffirming the presumption of constitutionality for such laws. Furthermore, Footnote Four in the decision is of particular importance for its implications on equal protection jurisprudence and its suggestion that certain types of legislation might demand more rigorous judicial review.