Gonzales v. Raich

Majority reasoning

The majority, led by Justice Stevens, reasoned that growing marijuana at home for personal use is economic activity because it involves producing a commodity for which a large interstate market exists, and that Congress could rationally conclude that exempting home-grown medical marijuana would undercut its broader effort to control the national drug market, just as the Court found in Wickard v. Filburn that home-grown wheat could be regulated to protect a national price-control scheme. The Court explained that unlike the narrow, single-subject statutes struck down in Lopez and Morrison, the Controlled Substances Act is a comprehensive scheme regulating an entire class of activities, and courts cannot carve out individual applications of an otherwise valid law just because a subset of the regulated conduct, viewed alone, seems harmless. The majority found that state law cannot expand or limit Congress's Commerce Clause power under the Supremacy Clause, and that California's exemption for medical marijuana could plausibly increase supply and demand in the broader illegal market through lax enforcement, unscrupulous doctors, or overproduction. It also rejected the argument that Congress needed specific findings about medical marijuana's effect on commerce, since courts only require a "rational basis" for Congress's judgment, not proof beyond doubt.

Dissent reasoning

Justice O'Connor, joined by Chief Justice Rehnquist and (in part) Justice Thomas, argued that the case is materially like Lopez and Morrison, which struck down federal laws reaching non-economic, purely local conduct, and that the majority's reasoning lets Congress escape those precedents just by folding local activity into a large regulatory package. She would have focused specifically on the intrastate, medical cultivation and possession of marijuana authorized and closely monitored by California law, arguing there was no real evidence that this narrow class of conduct has a substantial effect on the national marijuana market. She wrote that treating any activity as "economic" simply because it could substitute for a market purchase — as with home gardening substituting for grocery shopping — would erase any meaningful limit on federal power, and that Congress's bare assertions in the statute, unlike the detailed record in Wickard, cannot substitute for actual evidence connecting medical marijuana use to interstate commerce. Justice Thomas separately argued that respondents' conduct is not "commerce" at all under the Constitution's text, since Monson and Raich never bought, sold, or transported marijuana across state lines, and that the Necessary and Proper Clause does not permit Congress to regulate this narrow, state-monitored class of activity because there is no "obvious, plain" connection between banning their conduct and controlling the interstate drug trade. Thomas warned that the majority's broad definition of "economic activity" as any production, distribution, or consumption of commodities would let Congress regulate virtually anything, including quilting bees or home gardening, eliminating the constitutional structure of enumerated federal powers.