The Supreme Court’s Second Amendment rulings establish that the right to keep and bear arms belongs to individual people, applies against every level of government, and can only be regulated when the government can point to a comparable tradition of firearm regulation in American history. That framework was built through four major decisions between 2008 and 2024, and the Court is still working out the details through cases decided as recently as 2025.
Heller Established the Individual Right
District of Columbia v. Heller in 2008 was the first Supreme Court case to hold explicitly that the Second Amendment “protects an individual right to possess a firearm unconnected with service in a militia, and to use that arm for traditionally lawful purposes, such as self-defense within the home.”1Justia. District of Columbia v. Heller The case challenged a Washington, D.C. law that banned handgun ownership and required any other lawful firearm in the home to be kept disassembled or locked with a trigger device.
The Court struck down both provisions. A total ban on handguns eliminated “an entire class of ‘arms’ that Americans overwhelmingly choose for the lawful purpose of self-defense,” and the disassembly and trigger-lock requirements made it “impossible for citizens to use arms for the core lawful purpose of self-defense.”2Library of Congress. District of Columbia v. Heller The government could not ban the most popular type of home-defense weapon or force people to keep their guns inoperable.
Heller also drew boundaries that still matter. The majority stated the right is “not unlimited” and said “nothing in our opinion should be taken to cast doubt on longstanding prohibitions on the possession of firearms by felons and the mentally ill, or laws forbidding the carrying of firearms in sensitive places such as schools and government buildings, or laws imposing conditions and qualifications on the commercial sale of arms.”1Justia. District of Columbia v. Heller The Court called those “presumptively lawful regulatory measures” and said the list was not exhaustive. That language anchors nearly every gun-regulation case decided since.
McDonald Extended the Right to the States
Heller only applied to Washington, D.C., which is governed by federal law. State and local governments could still argue the Second Amendment did not bind them, because the Bill of Rights originally restrained only the federal government. McDonald v. City of Chicago closed that gap in 2010.
Chicago had its own handgun ban. The Court struck it down, holding “that the Due Process Clause of the Fourteenth Amendment incorporates the Second Amendment right recognized in Heller.”3Justia. McDonald v. City of Chicago The governing question was whether the right is “fundamental to our Nation’s particular scheme of ordered liberty,” and the Court said self-defense clearly qualifies.
After McDonald, every city, county, and state government became subject to the Second Amendment. Local handgun bans, outright possession prohibitions, and similar regulations around the country became immediately vulnerable to constitutional challenge.
Bruen Set the Current Legal Test
Heller and McDonald established the right but left judges without clear guidance on how to evaluate individual gun laws. The Supreme Court supplied that guidance in New York State Rifle & Pistol Association, Inc. v. Bruen (2022), and the test it chose is now the one every lower court must apply.
The majority rejected any balancing of public-safety benefits against the burden on gun owners. The opinion stated that Heller “expressly rejected any interest-balancing inquiry akin to intermediate scrutiny.”4Supreme Court of the United States. New York State Rifle and Pistol Association Inc. v. Bruen A court cannot uphold a gun law simply because the government shows it reduces crime. Statistics and policy arguments are irrelevant to the constitutional analysis.
The replacement test is straightforward to state and difficult to apply: “When the Second Amendment’s plain text covers an individual’s conduct, the Constitution presumptively protects that conduct. The government must then justify its regulation by demonstrating that it is consistent with the Nation’s historical tradition of firearm regulation.”4Supreme Court of the United States. New York State Rifle and Pistol Association Inc. v. Bruen The government carries the burden at the second step. If it cannot identify historical regulations that are relevantly similar to the modern law, the modern law fails.
Which Historical Period Counts
Bruen acknowledged two potentially relevant time periods: 1791, when the Second Amendment was ratified, and 1868, when the Fourteenth Amendment extended constitutional protections against state governments. The Court said it has “generally assumed” that the scope of protection is “pegged to the public understanding of the right when the Bill of Rights was adopted in 1791,” and that “late-19th-century evidence cannot provide much insight into the meaning of the Second Amendment when it contradicts earlier evidence.”4Supreme Court of the United States. New York State Rifle and Pistol Association Inc. v. Bruen Founding-era regulations carry the most weight; Reconstruction-era evidence serves as confirmation rather than an independent source of meaning.
How Close the Historical Match Must Be
The government does not need a perfect historical match. Bruen identified two metrics for comparison: whether the modern and historical regulations impose a “comparable burden on the right of armed self-defense” and whether that burden is “comparably justified.”4Supreme Court of the United States. New York State Rifle and Pistol Association Inc. v. Bruen A modern law need not be a “dead ringer” for a historical precursor. Even so, if the government is addressing a problem that existed in the eighteenth century and nobody regulated it back then, the absence of historical regulation cuts against the modern law.
Public Carry
Bruen also resolved the specific controversy that brought the case to the Court. New York had a “may-issue” licensing system that required applicants to show a special need for self-defense beyond what the general public faces. The Court struck it down, holding that the right to “bear” arms includes carrying them outside the home for self-defense. States can still require a license, but those systems must be “shall-issue,” meaning the government grants a permit to anyone who meets objective, pre-set criteria such as a minimum age, a clean background check, and completion of a safety course. A subjective “good reason” requirement on top of objective qualifications is unconstitutional.
Rahimi Softened the Bruen Framework
Bruen created immediate confusion in the lower courts. Some judges read it to require something close to a historical twin for every modern regulation. The Fifth Circuit used that reading to strike down the federal law banning firearm possession by people subject to domestic-violence restraining orders. The Supreme Court reversed in United States v. Rahimi (2024).
The Court held that “when a restraining order contains a finding that an individual poses a credible threat to the physical safety of an intimate partner, that individual may—consistent with the Second Amendment—be banned from possessing firearms while the order is in effect.”5Justia. United States v. Rahimi The historical justification was broad: “since the founding, our Nation’s firearm laws have included provisions preventing individuals who threaten physical harm to others from misusing firearms.”
Rahimi also pushed back against rigid originalism. The Court said “the Fifth Circuit erred in reading Bruen to require a ‘historical twin’ rather than a ‘historical analogue'” and clarified that courts should “consider whether the challenged regulation is consistent with the principles that underpin our regulatory tradition” rather than hunting for a precise historical match.5Justia. United States v. Rahimi A modern law “must comport with the principles underlying the Second Amendment, but it need not be a ‘dead ringer’ or a ‘historical twin.'” That gave the government meaningful room to defend modern regulations that fit broad historical patterns of disarming dangerous individuals.
What the Court Has Allowed Governments to Regulate
Every major Second Amendment opinion has emphasized that the right is not absolute. Heller’s list of “presumptively lawful regulatory measures” remains the starting point, and later cases have filled in the picture.
Prohibited Persons
Federal law bars several categories of people from possessing firearms or ammunition, including anyone convicted of a crime punishable by more than one year in prison, anyone involuntarily committed to a mental institution, fugitives, people subject to certain domestic-violence restraining orders, and those convicted of misdemeanor domestic violence.6Bureau of Alcohol, Tobacco, Firearms and Explosives. Identify Prohibited Persons Rahimi confirmed that at least some of these prohibitions survive Second Amendment scrutiny when they target individuals a court has found to pose a credible threat of violence.5Justia. United States v. Rahimi
Not every prohibition in that list has been tested. Federal law also bans firearm possession by anyone who is “an unlawful user of or addicted to any controlled substance,” which sweeps in marijuana users even in states where marijuana is legal. The Supreme Court heard oral arguments in United States v. Hemani in March 2026 to decide whether that prohibition is constitutional under Bruen’s test. No decision has been issued as of this writing.
Sensitive Places
Heller identified “schools and government buildings” as examples of sensitive places where firearms can be prohibited. Bruen accepted that the sensitive-places doctrine has historical support but said it could not “apply so broadly as to cover all places of public congregation that are not isolated from law enforcement.” Government buildings, courthouses, and schools are on solid ground. Broader designations covering things like public parks or commercial districts face tougher scrutiny.
Commercial Sales
Anyone in the business of dealing, manufacturing, or importing firearms must hold a Federal Firearms License from the ATF.7Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Firearms Licenses Licensing requirements, record-keeping obligations, and background-check mandates for commercial sales all fall within what Heller called “conditions and qualifications on the commercial sale of arms.”1Justia. District of Columbia v. Heller No Supreme Court decision has cast doubt on these regulations.
Which Weapons Are Protected
The Second Amendment does not cover every weapon. Heller held that protection extends to weapons “in common use at the time” for lawful purposes and does not cover “dangerous and unusual weapons.”1Justia. District of Columbia v. Heller Handguns easily qualify as commonly used. Fully automatic military rifles do not. The line between those extremes is still contested, particularly for semiautomatic rifles that are popular with civilian owners but that critics argue are designed for combat.
Recent Cases on Firearm Technology
Two recent decisions tested how existing federal statutes apply to weapons technology Congress did not anticipate. These were statutory interpretation cases rather than Second Amendment rulings, but they directly affect what the federal government can regulate.
Bump Stocks
In Garland v. Cargill (2024), the Court held that a bump stock, an accessory that lets a semiautomatic rifle fire at a much higher rate, does not convert the rifle into a “machinegun” as defined by federal law. The statutory definition requires a weapon that shoots “automatically more than one shot . . . by a single function of the trigger,” and the Court found that a bump-stock-equipped rifle still fires one round per trigger pull.8Justia. Garland v. Cargill The ATF had exceeded its authority by classifying bump stocks as machineguns by regulation. Congress could still ban them through new legislation, but the executive branch cannot do it by reinterpreting an existing statute.
Ghost Guns
Bondi v. VanDerStok (2025) went the other direction. The ATF had issued a rule treating weapons parts kits that can be readily converted into functional firearms, along with partially complete frames and receivers, as “firearms” under the Gun Control Act. In a 7–2 decision, the Court upheld the rule, holding it “is not facially inconsistent with the GCA” because the statutory definition includes any weapon that “may readily be converted to expel a projectile by the action of an explosive.”9Justia. Bondi v. VanDerStok Manufacturers and sellers of ghost-gun kits must comply with the same licensing, serial-number, and background-check requirements that apply to traditional firearms.
What the Court Has Not Yet Decided
The structural questions are settled. The details are not. Lower courts are actively splitting on issues that will likely return to the Supreme Court.
The marijuana-and-guns question in Hemani is the most immediate. A ruling against the current ban could call other prohibited-person categories into question, particularly those that do not involve violent conduct.
Age-based restrictions are another flashpoint. The Fifth Circuit struck down the federal ban on licensed dealers selling handguns to 18-to-20-year-olds, holding that the Second Amendment’s text contains no age restriction and the government failed to identify a historical analogue. Other circuits have upheld similar bans. That kind of circuit split is exactly what draws Supreme Court review.
The broadest open question is how much weight Rahimi’s “principles” language carries. Rahimi gave the government more flexibility than a strict reading of Bruen would have, but the opinion was narrow and tied to the facts of domestic-violence restraining orders. Whether that flexibility extends to assault-weapon bans, magazine-capacity limits, waiting periods, or red-flag laws is being litigated in lower courts right now, and each outcome depends on how broadly or narrowly judges read the Bruen-Rahimi framework.