Commerce Clause
Article I, § 8, cl. 3 grants Congress the power to regulate commerce with foreign nations, among the several states, and with Indian tribes — the primary constitutional basis for most federal legislation.
Elements / Test
Three categories of permissible regulation (United States v. Lopez):
- Channels of interstate commerce (roads, waterways, airspace)
- Instrumentalities of interstate commerce, and persons or things in interstate commerce
- Activities that substantially affect interstate commerce
Substantial effects test:
- Activity must be economic/commercial in nature (Lopez — gun possession is not)
- Aggregation principle: even local activity counts if the class of activities substantially affects commerce (Wickard v. Filburn, Gonzales v. Raich)
- Comprehensive regulatory scheme: Congress can reach intrastate activity if necessary to make broader regulation effective (Raich)
Exceptions and Edge Cases
- Lopez limits: Non-economic activity (gun possession near schools) cannot be regulated even with jurisdictional element findings
- Morrison limit: Violence against women not economic activity — no substantial effects even with congressional findings
- Raich expansion: Homegrown marijuana part of comprehensive CSA scheme; Necessary and Proper Clause reinforces reach
- NFIB v. Sebelius: Commerce Clause does not permit mandate to purchase insurance (regulating inactivity); upheld as tax
- Dormant Commerce Clause: Implied negative — states may not discriminate against or unduly burden interstate commerce
- State regulation: Pike balancing (non-discriminatory burdens) vs. strict scrutiny (discriminatory regulation)
Policy Rationale
Enables national economic regulation; prevents balkanization of markets; responds to collective action problems states cannot solve individually. Post-New Deal expansion reflects shift to national economy. Lopez/Morrison reflect federalism revival — not all social problems are commerce.
Key Cases
| Case | Rule |
|---|---|
| Wickard v. Filburn (1942) | Aggregation principle — wheat grown for home consumption affects interstate market |
| Heart of Atlanta Motel v. United States (1964) | Congress may regulate racial discrimination in businesses affecting interstate travel |
| United States v. Lopez (1995) | Gun-Free School Zones Act exceeds Commerce Clause; non-economic activity not substantially affecting commerce |
| United States v. Morrison (2000) | Violence Against Women Act invalid; gender-motivated violence not economic activity |
| Gonzales v. Raich (2005) | CSA applied to homegrown marijuana; comprehensive regulatory scheme |
| NFIB v. Sebelius (2012) | Commerce Clause does not authorize mandate to purchase; cannot regulate inactivity |