Printz v. United States

Majority reasoning

The majority, examining historical practice, found no early example of Congress compelling state executive officers (as opposed to judges) to administer federal law, and read the near-total absence of such statutes across two centuries as evidence the power was assumed not to exist. It reasoned that the Constitution's structure creates a system of dual sovereignty in which the federal government regulates individuals, not states or their officials, and that commandeering state officers would also undermine the President's exclusive constitutional duty to execute the laws by letting Congress bypass presidential control. The Court rejected the government's proposed distinction between "policymaking" and mere "ministerial" enforcement duties as unworkable and, in any event, irrelevant, since dragooning officers into implementation is no more compatible with state autonomy than dragooning them into policymaking. It also rejected the Necessary and Proper Clause argument, explaining that a law violating state sovereignty is not "proper" even if otherwise necessary to a valid federal power, and it directly answered Justice Souter's Federalist No. 27 argument by explaining, in a lengthy footnote exchange, why "incorporated" and "auxiliary" language described only a duty not to obstruct federal law rather than an affirmative command.

Dissent reasoning

Justice Stevens, joined by Souter, Ginsburg, and Breyer, argued that the Necessary and Proper Clause plainly authorizes Congress to enlist local officers to help enforce a valid Commerce Clause regulation of handgun sales, and that the Tenth Amendment only withholds powers not delegated to Congress rather than limiting how delegated powers may be carried out. He argued early statutes requiring state judges and court clerks to perform essentially executive naturalization and administrative tasks show the Founders saw no constitutional bar to enlisting state officials, and that The Federalist No. 27's statement that state officers "will be rendered auxiliary to the enforcement of [federal] laws" directly supports Congress's power here. He also argued the burden imposed was minimal, temporary, and no different in kind from duties Congress could impose on private citizens, so the majority's fear of destroying state sovereignty and presidential accountability was overstated and internally inconsistent. Justice Souter, dissenting separately, agreed with the Stevens dissent's bottom line but reached it specifically through The Federalist No. 27 and No. 44, arguing Hamilton's language most naturally means Congress can require state "auxiliaries" to take action within the officer's own branch's proper role, while adding that any such conscription should require fair compensation to the states. Justice Breyer, joined by Stevens, added that comparative experience from federal systems like Switzerland, Germany, and the European Union shows that requiring constituent governments to implement central laws can protect local autonomy and liberty rather than threaten it, undercutting the majority's assumption that commandeering is inherently more dangerous to federalism than a large federal bureaucracy.