Also known as: substantially affects interstate commerce · substantially affecting interstate commerce · substantial effect on interstate commerce · substantially affected interstate commerce · Commerce Clause substantial-effects test · affectation doctrine
Written by attorneys · grounded in primary & secondary sources — see below
Activities that have a substantial relation to interstate commerce. Congress may regulate such activities under the Commerce Clause when they are economic in nature and their effects may be aggregated across similar instances to establish the required impact on interstate markets.
Sydney Santos grows marijuana plants in her backyard solely for personal medical use under a state program. Federal agents seize the plants under a nationwide drug-control statute. The activity counts as economic production that can be aggregated with similar local cultivation to show a substantial effect on the interstate marijuana market.
Sylvia Santos carries a handgun in her car while dropping off her child at a local tutoring center. Prosecutors charge her under a federal statute banning firearms on school-related property. The possession is noneconomic and intrastate, so it cannot be aggregated to establish a substantial effect on interstate commerce.
Select any source to read its text and confirm it supports the definition.
Solomon Silver assaults Samantha Stone in a private home after an argument. Stone sues under a federal civil remedy for gender-motivated violence. The conduct is noneconomic and lacks a direct tie to any interstate market, preventing aggregation to find a substantial effect on commerce.
Skylar Sullivan operates a textile mill that ships goods across state lines. Federal inspectors require compliance with minimum-wage rules for all employees. The intrastate labor practices are so intertwined with interstate shipments that they substantially affect commerce and fall within federal reach.
Santiago Sanchez drives an overloaded truck on state highways carrying goods for his company. State officials enforce size and weight restrictions that limit interstate hauls. The rules regulate local conduct that directly burdens the channels of interstate commerce and therefore substantially affect it.
Spectrum Financial refuses to buy health insurance for its employees. Congress attempts to compel the purchase through a commerce-based penalty. Inactivity in the insurance market is not economic activity that can be aggregated to show a substantial effect on interstate commerce.
Aggregation is permitted only when the regulated conduct is economic in nature. Courts then consider the combined impact of many similar instances rather than any single case. Noneconomic activity such as simple gun possession cannot be aggregated.
Yes when the production is economic and substitutes for market purchases. Widespread self-supply by many farmers reduces demand and alters prices in the national commodity market. The aggregate effect supplies the required substantial relation to interstate commerce.
The activity lacks any commercial character and bears no direct relation to an interstate market. It cannot be aggregated because aggregation applies only to economic conduct. The statute therefore exceeds Congress's authority to regulate activities that substantially affect interstate commerce.
The test requires a rational basis for concluding that the class of activity substantially affects interstate commerce. It limits federal power to economic conduct whose aggregate impact is clear. Purely local noneconomic matters remain subject to state police power.
…by the rest of the Constitution. Art. I, § 1. Where the Constitution was meant to grant federal authority over an activity substantially affecting interstate commerce, the Constitution contains an enumerated power over that particular activity. Indeed, the Framers knew that many of the other enumerated powers in § 8 dealt with matters that substantially…