United States v. Carolene Products Co.
The Court upheld a federal law banning interstate shipment of "filled milk" — skimmed milk mixed with vegetable oil to look like real milk or cream — ruling that Congress had a rational basis for treating it as a health and fraud risk.
The decision is best remembered for a footnote suggesting that courts should scrutinize laws more closely when they restrict voting, free speech, or target racial and religious minorities — a footnote that later shaped how the Court reviews civil rights and civil liberties cases.
“prejudice against discrete and insular minorities may be a special condition, which tends seriously to curtail the operation of those political processes ordinarily to be relied upon to protect minorities, and which may call for a correspondingly more searching judicial inquiry”
A footnote suggesting courts should scrutinize laws harming minorities more closely than ordinary economic laws.
How it got here: A federal trial court dismissed the indictment on an earlier ruling striking the Act; the government appealed directly to the Supreme Court.
The Case in Depth
What happened
A company shipped "Milnut," a blend of condensed skimmed milk and coconut oil made to resemble condensed milk or cream, across state lines. Congress's 1923 Filled Milk Act banned such shipments, declaring the product an adulterated food injurious to health and a fraud on consumers. The company was indicted for violating the Act and challenged the law's validity.
The question before the Court
Could Congress ban shipping a cheap milk substitute called "filled milk" across state lines without violating the Constitution?
Why it matters
The ruling let Congress keep filled-milk products out of interstate commerce, protecting the dairy industry and giving consumers assurance about what they were buying. More lastingly, its famous footnote laid the groundwork for courts later applying tougher scrutiny to laws burdening minorities or fundamental rights, influencing decades of constitutional litigation well beyond food regulation.
What changes now
The case was reversed, meaning the indictment against the company was reinstated and the prosecution could proceed instead of being dismissed. The ruling settled that filled milk could be barred from interstate commerce nationwide. Its footnote about heightened scrutiny for minority-protective or political-process laws had no immediate practical effect on this case but became an influential reference point in later constitutional cases.
What this does not decide
The Court expressly declined to decide whether laws restricting voting, speech, political organizing, or targeting religious, national, or racial minorities should receive stricter judicial review than ordinary economic regulation — it merely raised the possibility in a footnote without resolving it.
Concurrences and dissents
Concurrence in part — Justice Black
Justice Black agreed with the result and joined the whole opinion except the section discussing when courts may look beyond a statute's face at evidence about whether its factual premises are true. He did not explain his objection in the text.
Concurrence — Justice Butler
Justice Butler agreed the indictment stated a valid charge on its face but stressed that the company should still be allowed to introduce evidence at trial showing the product was not actually injurious to health or fraudulent, since the statute should be read to avoid a serious constitutional problem if applied to genuinely wholesome products.
Dissent — Justice McReynolds
Justice McReynolds dissented without elaboration, stating only that he believed the lower court's judgment dismissing the indictment should be affirmed.
How the Court got there
The legal reasoning, step by step
- The Court began with Congress's commerce power, which it described as complete and limited only by specific constitutional prohibitions, meaning Congress may exclude articles from interstate shipment that it reasonably believes harm public health, morals, or welfare.
- Because the law only restricted commerce rather than regulating conduct within a state, the Court found no Tenth Amendment problem and turned to whether the ban violated the Fifth Amendment's due process guarantee.
- Applying what would become known as rational-basis review — the most lenient constitutional test, under which a law survives if any reasonably conceivable set of facts could support it — the Court held that legislatures are presumed to have acted on adequate evidence unless the challenger shows the law is arbitrary.
- The Court found that congressional committee hearings and outside evidence about vitamin deficiencies in filled milk gave lawmakers ample basis to conclude the product was a health risk and facilitated fraud, satisfying the rational-basis standard.
- In a footnote, the Court flagged that this deferential approach might not apply with equal force to laws restricting voting rights, free expression, or laws aimed at religious, national, or racial minorities, suggesting such laws might warrant closer judicial review.
- Concluding that the statute's validity was, at minimum, debatable and therefore within Congress's judgment to decide, the Court held the ban on filled milk shipments a valid exercise of the commerce power that did not violate due process.
Doctrinal impact
Cases affected by this decision
Reaffirms Hebe Co. v. Shaw (248 U.S. 297)
The Court relied on this earlier ruling upholding a similar state ban on imitation milk products as still good law.