United States v. Lopez

Justice Kennedy agreed that the Act was unconstitutional, but stressed the limited nature of the decision. The Court's Commerce Clause precedents developed unevenly as the Nation moved toward a unified economy, and stare decisis strongly counsels against reopening Congress's established authority to regulate genuinely commercial transactions in a national market.

In his view, the Court nevertheless has a duty to preserve federalism. Federalism protects liberty and political accountability by allowing citizens to identify whether federal or state officials are responsible for a policy. When Congress regulates an area outside ordinary commerce that has traditionally been governed by the States, the judiciary must ensure that the federal-state balance has not been erased.

The statute criminalized local gun possession solely because it occurred near schools, an area closely connected to state responsibility for education and local criminal law. States were already experimenting with many approaches to school safety, and Congress lacked a sufficiently strong commercial justification to displace those state choices with a broad federal prohibition.

Justice Thomas joined the majority but argued that existing Commerce Clause doctrine had departed substantially from the Constitution's original meaning. At the founding, he maintained, “commerce” ordinarily meant trade, exchange, and transportation for trade, not all activity with downstream economic consequences.

The substantial-effects test, if applied without a limiting principle, risks giving Congress a general police power over ordinary life. It could permit regulation of subjects such as marriage, littering, animal cruelty, or mere gun possession because each may have some aggregate economic consequence.

Justice Thomas also argued that an unlimited substantial-effects theory would make many of Congress's separately enumerated powers unnecessary. He urged the Court, in a future case, to reconsider the doctrine in a way more faithful to constitutional text and history while accounting for reliance on modern precedent.

Justice Stevens agreed with Justice Breyer that Congress could rationally conclude that guns near schools threaten education and, through education, interstate commerce. He also agreed with Justice Souter that the majority's approach resembled the discredited formalism of pre-New Deal Commerce Clause jurisprudence.

He added that firearms are articles of commerce and can be used to restrain commerce. Because gun possession follows from commercial activity and guns have potentially harmful uses, Congress's authority to regulate commerce in firearms includes authority to prohibit their possession in particular places, including school zones.

Justice Souter maintained that the Court should uphold Commerce Clause legislation whenever Congress could rationally find that the regulated conduct substantially affects interstate commerce and the chosen means are reasonably adapted to that legitimate end. This deferential standard respects Congress's institutional competence and political accountability in making empirical economic judgments.

He viewed the majority's commercial-versus-noncommercial distinction as a return to the formal distinctions between direct and indirect effects, and between production and commerce, that the Court abandoned after 1937. In his view, recalibrating judicial deference based on a judge-made label for the activity invites the same kind of policy-driven review that characterized the Lochner era.

The fact that education and criminal law are traditional state concerns did not weaken Congress's otherwise valid commerce power. Likewise, the absence of formal congressional findings did not change the constitutional test: the relevant question is whether Congress could rationally have found a substantial effect, not whether it made express findings or chose the wisest policy.

Justice Souter concluded that Justice Breyer's evidence demonstrated a rational basis for Congress to connect gun violence near schools to impaired education and national economic harm. He warned that the majority's decision, though perhaps appearing narrow, created an opening for renewed judicial restriction of federal economic legislation.

Justice Breyer applied three principles from modern precedent: Congress may regulate local activity that significantly affects interstate commerce; courts consider the cumulative effect of a class of similar conduct rather than a single instance; and courts give Congress rational-basis deference when assessing empirical connections to commerce.

In his view, Congress could rationally find that gun violence in and around schools is widespread and seriously disrupts learning. Congress could also rationally find that educational quality materially affects workforce skills, productivity, business-location decisions, international competitiveness, and the national economy.

The connection was sufficiently substantial when viewed practically and in the aggregate. Just as Congress could regulate homegrown wheat in Wickard, local loan sharking in Perez, and racial discrimination at local places of accommodation in prior cases, it could address a widespread local practice whose combined economic effects were nationally significant.

Justice Breyer rejected the majority's assurance that its rule would be limited. He argued that the commercial/noncommercial line is difficult to administer because schools spend substantial sums, purchase goods and services, and provide workforce preparation. He also warned that the new distinction created uncertainty about many federal statutes regulating conduct said to affect commerce.