Dormant Commerce Clause

The "dormant" Commerce Clause, also known as the "negative" Commerce Clause, is a legal doctrine that courts in the United States have inferred from the Commerce Clause in Article I of the United States Constitution. The Commerce Clause expressly grants Congress the power to regulate commerce "among the several states." The idea behind the dormant Commerce Clause is that this grant of power implies a negative converse—a restriction prohibiting a state from passing legislation that improperly burdens or discriminates against interstate commerce. The restriction is self-executing and applies even in the absence of a conflict between state and federal statutes, but Congress may allow states to pass legislation that would otherwise be forbidden by the dormant Commerce Clause.