Merchants Exchange of St. Louis v. Missouri Ex Rel. Barker

Background

A Missouri law applied in cities over 75,000 people and declared buildings used to store or transfer grain for pay to be public warehouses. The law prohibited anyone except a state-appointed and bonded weigher from issuing weight certificates or charging for weighing at such public warehouses. In 1915 the state Attorney General sued a local board of trade, a Merchants Exchange, saying it ran a paid weighing bureau, issued weight certificates, and charged fees in violation of the statute. The board admitted those facts but argued the law unfairly deprived its members’ rights and burdened interstate commerce.

Reasoning

The Court considered two main challenges: that the law violated the Fourteenth Amendment’s protections for property and equal treatment, and that it unlawfully burdened interstate commerce or was overridden by federal grain legislation. The Court said regulating weights and measures to prevent fraud is a legitimate state police power. It found the prohibition on private weight certificates at public warehouses to be a reasonable way to avoid confusion or deception, and not an arbitrary pick against grain dealers. The Court also held the federal Grain Standards Act dealt with quality standards, not weighing, and did not supersede Missouri’s rule.

Real world impact

By affirming the state court, the decision allows Missouri to bar private weighing bureaus and weight certificates at covered public warehouses, to enforce penalties, and to remove a board’s weighing authority. The ruling means boards of trade in large cities cannot replace official state weighers when those weighers are stationed at public elevators. It also signals that federal grain quality rules do not automatically replace state inspection and weighing laws.