Essential terms and doctrines in Second Amendment jurisprudence. Understanding these concepts is crucial for comprehending Supreme Court decisions and constitutional debates. Each concept page includes definitions, historical development, and current application in law.
18th Century Meaning: Properly functioning, trained, and disciplined—not heavily regulated by government.
Modern Misunderstanding: Often incorrectly interpreted as government-controlled or strictly regulated.
Supreme Court: Heller concluded "well-regulated" implies proper discipline and training.
Keep: To have, possess, or own weapons.
Bear: To carry weapons, particularly for confrontation.
Arms: Weapons of offense or defense, not limited to military weapons.
Strongest prohibition language in the Constitution, but not absolute. Courts recognize some regulations as constitutional.
Refers to individuals, not collective body or states. Consistent with First and Fourth Amendment usage.
Established: NYSRPA v. Bruen (2022)
Standard: Government must prove modern regulations are consistent with historical tradition of firearm regulation.
Replaces: Two-step means-end scrutiny test previously used by lower courts.
Traditional tiers (rational basis, intermediate, strict) rejected for Second Amendment after Bruen.
Process by which Bill of Rights applies to states through 14th Amendment. Second Amendment incorporated in McDonald (2010).
Principle: Second Amendment protects weapons "in common use at the time" for lawful purposes.
Origin: Miller (1939), clarified in Heller (2008)
Application: Protects handguns, likely AR-15s; may not protect unusual weapons.
Principle: Firearms can be prohibited in certain sensitive locations.
Established: Schools, government buildings, legislative assemblies.
Disputed: Scope of doctrine post-Bruen.
Category of weapons that may fall outside Second Amendment protection. Definition remains contested.
Certain individuals (felons, mentally ill, domestic violence) can be constitutionally prohibited from possessing firearms.
Second Amendment protects individual right unconnected to militia service. Established in Heller (2008).
Pre-Heller theory that Second Amendment only protected state militia rights. Now rejected by Supreme Court.
View that self-defense is pre-existing natural right recognized, not created, by Constitution.
Historical view emphasizing citizen militia as check on government power and standing armies.
Historically: All able-bodied male citizens of military age. Today: Organized (National Guard) and unorganized (all others).
Founding-era fear that professional military could oppress citizens. Militia seen as alternative.
Class-based restrictions on arms and hunting that Americans consciously rejected.
Post-Civil War laws restricting freedmen's gun rights, spurring 14th Amendment and federal civil rights acts.
Shall-Issue: Objective criteria, must issue if met (constitutional).
May-Issue: Discretionary, "good cause" required (unconstitutional after Bruen).
Limited restrictions on when, where, and how arms can be carried, analogous to First Amendment doctrine.
Legislative term for certain semi-automatic firearms. Constitutional status disputed post-Bruen.
Requirements to register firearms or obtain licenses. Constitutionality depends on burden imposed.
Legal concepts and doctrines shape how courts interpret and apply the Second Amendment. Understanding these terms is essential for:
Judges apply these doctrines when evaluating Second Amendment challenges. The controlling framework is now the "text, history, and tradition" test from Bruen, which requires understanding both modern concepts and historical practices.
Legal concepts evolve through Supreme Court decisions. What was accepted doctrine under Miller changed with Heller, and shifted again with Bruen. This site tracks current understanding while providing historical context.