United States v. Miller
The Court ruled that the Second Amendment did not shield two men from federal charges for transporting an unregistered sawed-off shotgun across state lines, because nothing in the record showed that this kind of gun had any connection to a well-regulated militia.
The decision reinstated the criminal charges and tied Second Amendment protection to weapons useful for militia service, a framework that would guide gun-rights cases for decades.
“we cannot say that the Second Amendment guarantees the right to keep and bear such an instrument”
The Court's central holding tying Second Amendment protection to a weapon's militia usefulness.
How it got here: A federal district court sustained the men's demurrer and threw out the indictment, ruling the law violated the Second Amendment; the government appealed directly to the Supreme Court.
The Case in Depth
What happened
Jack Miller and Frank Layton were indicted for transporting a sawed-off shotgun from Oklahoma to Arkansas without registering it or having the required tax stamp, violating the 1934 National Firearms Act. They challenged the law, arguing it improperly invaded powers reserved to the states and violated their Second Amendment right to keep and bear arms.
The question before the Court
Did the Second Amendment protect two men's right to carry a sawed-off shotgun across state lines without registering it under a federal law?
Why it matters
The ruling meant federal registration and tax requirements for short-barreled shotguns could be enforced, and it gave courts a framework for deciding future Second Amendment disputes by asking whether a weapon has a reasonable link to militia service, shaping gun regulation litigation for generations.
What changes now
The Supreme Court sent the case back to the district court so proceedings could continue on the reinstated indictment. This was a final ruling on the legal question of whether the Second Amendment barred the charges, but it left factual questions about the specific defendants and weapon to be resolved on remand. The decision's militia-based test went on to guide Second Amendment cases for decades.
What this does not decide
The Court did not rule on whether other kinds of firearms are protected by the Second Amendment, and it did not decide the case on a full evidentiary record — it noted only that no evidence had been presented showing this particular weapon related to militia use, leaving that question open for further proceedings.
How the Court got there
The legal reasoning, step by step
- The Court first rejected the argument that the National Firearms Act improperly invaded state police power, relying on earlier rulings upholding similar federal taxing measures, including one involving machine guns and several involving narcotics regulation.
- The Court then explained that the Second Amendment must be read in light of its purpose: preserving the effectiveness of citizen militias that the Constitution expected states to maintain, as distinguished from standing armies.
- Applying that purpose, the Court held that the Second Amendment protects a weapon only if there is some reasonable relationship between that weapon and the preservation or efficiency of a well-regulated militia.
- The Court reviewed historical sources describing the militia as ordinary citizens who supplied their own arms of the kind then in common military use, to show what the Amendment was meant to protect.
- Because nothing in the case record showed that a shotgun with a barrel under eighteen inches had any reasonable relationship to militia service, the Court could not say the Second Amendment guaranteed a right to possess it.
Doctrinal impact
Cases affected by this decision
Reaffirms Sonzinsky v. United States (300 U.S. 506)
Relied on to uphold the firearms law's tax provisions as a valid exercise of federal power.