No. 18-431October Term 2018Decided Jun 24, 2019
United States v. Davis
The Supreme Court said this part of the federal firearm law is too vague to use for extra criminal penalties.
Case status
- Current stage
- Decided
- Latest event
- Decision released Jun 24, 2019
- What it's about
The case concerns whether a federal law that adds extra penalties for using or carrying a firearm during a "crime of violence" is too vague in the way it defines that term. It arose from firearm charges against Maurice Davis and Andre Glover tied to Hobbs Act robbery and conspiracy charges.
Question presented
Whether the subsection-specific definition of "crime of violence" in 18 U.S.C. 924(c)(3)(B), which applies only in the limited context of a federal criminal prosecution for possessing, using, or carrying a firearm in connection with acts comprising such a crime, is unconstitutionally vague.
- Case path
United States Court of Appeals for the Fifth Circuit / Decision released Jun 24, 2019
- Area
Gun Rights
Briefing
What it's about
The case asked whether part of a federal gun law, 18 U.S.C. §924(c)(3)(B), was too vague in how it defined a "crime of violence." On June 24, 2019, the Court said that subsection is unconstitutional.
Vote
The Court decided on June 24, 2019, that §924(c)(3)(B) is unconstitutional. The prompt does not provide the vote count or opinion lineup.
Impact
This affects federal prosecutions that seek extra prison time for using or carrying a firearm during a crime labeled violent under that definition. For example, defendants charged in cases tied to robbery or conspiracy may challenge added penalties based on §924(c)(3)(B).
What's next
The Supreme Court has finished this case. The practical next step is for lower courts to apply that ruling in Davis, Glover, and similar federal cases.
What was the main fight in United States v. Davis?
The main issue was whether §924(c)(3)(B) defined "crime of violence" too vaguely. The Court said that part of the law is unconstitutional.
Who is most affected by this decision?
Federal defendants facing added gun penalties under §924(c)(3)(B) are most directly affected. That includes some cases linked to Hobbs Act robbery or conspiracy charges.
What happens after the Supreme Court's decision in this case?
The Supreme Court's work on this docket is over. Lower courts must now handle the defendants' cases and similar cases under the new rule.
Decision
What the Court decided
The Supreme Court said this part of the federal firearm law is too vague to use for extra criminal penalties.
Impact
This affects federal prosecutions that seek extra prison time for using or carrying a firearm during a crime labeled violent under that definition. For example, defendants charged in cases tied to robbery or conspiracy may challenge added penalties based on §924(c)(3)(B).
Not official Court text.
Opinion documents
Related cases




Grounding
- Grounding
- Primary materials plus reporting.
- Note
- Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.
- Checked
- Jun 1, 2026
- Method
- Methodology
Primary materials10
Supreme Court docket 18-431
docket | Jun 1, 2026
Primary case document
Supreme Court document | Jun 1, 2026
CourtListener docket record
docket | Jun 1, 2026
Questions Presented
brief | May 24, 2026
opinion
opinion | Jun 24, 2019
Petition
brief | Oct 3, 2018
SupremeCourt.gov
official | Jun 1, 2026
SupremeCourt.gov
official | Jun 1, 2026
SupremeCourt.gov
official | Jun 1, 2026
SupremeCourt.gov
official | Jun 1, 2026