McDonald v. City of Chicago

In McDonald et al. v. City of Chicago, Illinois, et al., 177 L. Ed. 2d 894 (2010), the Supreme Court of the United States considered whether the Second Amendment right recognized in District of Columbia v. Heller applied against state and local governments.

The case arose after Chicago and another local government maintained handgun regulations that prevented ordinary residents from lawfully possessing handguns in their homes. The petitioners, including Otis McDonald, wanted to keep handguns for self-defense but were blocked by local law. After Heller held that the Second Amendment protects an individual right to possess a handgun in the home for self-defense against federal interference, the petitioners argued that state and municipal governments should be bound by the same constitutional rule.

Lower courts rejected the challenge because earlier Supreme Court precedent had not applied the Second Amendment to the states. The case then reached the Supreme Court, where the central question became whether the Fourteenth Amendment makes the Second Amendment enforceable against state and local governments.

The issue before the Court was whether a city or state can avoid the Second Amendment because the amendment originally restricted only the federal government. In plain terms, the Court had to decide whether the constitutional right to keep and bear arms, including the right to possess a handgun in the home for self-defense recognized in Heller, also limits police-power regulations passed by cities, counties, and states.

For officers and local officials, the practical question was whether local firearm ordinances could be enforced without regard to the Second Amendment, or whether those ordinances had to comply with the same constitutional protection that applies to federal law.

The Supreme Court held that the Second Amendment right to keep and bear arms is fully applicable to the states through the Fourteenth Amendment. Justice Alito announced the judgment of the Court, and a majority concluded that the right recognized in Heller is fundamental to the American scheme of ordered liberty and deeply rooted in the Nation’s history and tradition.

The practical rule from McDonald is that state and local governments may not enforce firearm laws that violate the individual Second Amendment right to keep and bear arms for lawful purposes, especially possession of a handgun in the home for self-defense. The Court did not hold that every firearm regulation is unconstitutional. McDonald incorporated the Second Amendment against the states, but it did not erase all licensing systems, possession restrictions, or public-safety regulations. Those details must be evaluated under later Second Amendment case law and applicable state and local law.

The Court reversed the lower-court judgment and sent the case back for further proceedings consistent with the ruling. Justice Thomas agreed in the judgment but would have relied on the Fourteenth Amendment’s Privileges or Immunities Clause rather than substantive due process. Justices Stevens, Breyer, Ginsburg, and Sotomayor dissented.

McDonald matters to police because it means local firearm enforcement must account for the Second Amendment. A city ordinance is not insulated from constitutional review simply because it is local. If a state or municipal law effectively prohibits ordinary law-abiding residents from possessing a handgun in the home for self-defense, that law is constitutionally vulnerable under Heller and McDonald.

For patrol officers, detectives, and supervisors, the case does not create a stand-alone search, seizure, or evidence rule. It does not say that the presence of a firearm is always lawful, and it does not prevent officers from enforcing valid firearm laws, investigating unlawful possession, responding to armed threats, or taking lawful safety measures. It also does not decide the validity of every permit requirement, carrying restriction, prohibited-person law, or condition on firearm possession.

The main operational lesson is that departments should not rely on outdated local bans or ordinances that conflict with the incorporated Second Amendment right. Officers enforcing firearm laws should use current statutes, current department guidance, and prosecutor-approved charging standards. When a firearm case depends on a local ordinance that broadly restricts handgun possession in the home, supervisors and legal advisors should verify that the ordinance remains enforceable after McDonald and later Supreme Court decisions.