{"argument_date":"2010-02-23T00:00:00Z","arguments":[{"argument_date":"2010-02-23T00:00:00Z","heading":"What happened at the argument","official_detail_url":"https://www.supremecourt.gov/oral_arguments/argument_transcript/2009","official_transcript_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","paragraphs":["Mr. Horwich argued that the statutory structure treats firearm types as distinct elements.","Mr. Fisher argued that no defendant received more than ten years without a machinegun finding.","Justice Scalia questioned whether the statutory language supports treating weapon type as an element.","Justice Breyer asked why the Court should depart from its prior interpretation of similar statutes."],"reargument":false,"sequence":1,"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 10, lines 3-27","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 10, lines 3-27"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 11, lines 13-25","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 11, lines 13-25"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 15-21","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 15-21"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 29-35","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 29-35"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 41-45","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 41-45"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 26, lines 37-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 26, lines 37-7"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 17-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 17-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 43-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 43-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 7-15","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 7-15"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 4, lines 29-39","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 4, lines 29-39"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 4, lines 45-49","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 4, lines 45-49"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 5, lines 25-37","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 5, lines 25-37"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 6, lines 27-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 6, lines 27-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 7, lines 19-23","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 7, lines 19-23"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 7, lines 45-21","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 7, lines 45-21"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 19-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 19-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 5-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 5-7"}]}],"caption":"United States v. O'Brien","case_history":[{"changed_at":"2026-08-29T20:06:25.677282Z","explanation":"An official oral-argument transcript was verified.","status":"argued"}],"case_status":"argued","dek":"The dispute centers on whether using a machinegun creates a distinct crime or merely increases the penalty for the same offense.","dek_sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 26, lines 37-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 26, lines 37-7"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 17-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 17-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 19-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 19-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 5-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 5-7"}],"dispositions":[],"latest_court_document_date":"2010-02-23T00:00:00Z","maturity":"official_transcript","official_detail_url":"https://www.supremecourt.gov/oral_arguments/argument_transcript/2009","official_disposition_urls":[],"official_docket_url":"https://www.supremecourt.gov/docket/docketfiles/html/public/08-1569.html","primary_docket":"08-1569","revisions":[{"correction_note":"Rewritten to the concise citizen-facing editorial standard.","created_at":"2026-08-31T01:31:26.659640Z","maturity":"official_transcript","revision_number":1},{"correction_note":"Migrated to the dated official Court activity contract without model use.","created_at":"2026-09-05T03:22:24Z","maturity":"official_transcript","revision_number":2}],"schema_version":"1.1","sections":[{"heading":"What this case is about","paragraphs":["The case tests how courts interpret federal firearm statutes. It asks if specific weapon types define separate crimes or act as sentencing factors."],"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 26, lines 37-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 26, lines 37-7"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 17-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 17-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 19-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 19-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 5-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 5-7"}]},{"heading":"How the case got here","paragraphs":["The Supreme Court heard oral argument in this case on February 23, 2010."],"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 7-15","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 7-15"}]},{"heading":"What each side wants","paragraphs":["the side that brought the case wants the Court to treat the machinegun provision as a separate crime requiring a new jury verdict.","The government wants the Court to treat the machinegun provision as a sentencing factor that judges may consider."],"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 26, lines 37-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 26, lines 37-7"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 17-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 17-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 19-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 19-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 5-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 5-7"}]},{"heading":"What each side says","paragraphs":["the side that brought the case argues that moving firearm type provisions signals they are distinct elements, not sentencing factors.","The government argues that recidivism and weapon type traditionally function as sentencing factors, not elements."],"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 26, lines 37-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 26, lines 37-7"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 17-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 17-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 19-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 19-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 5-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 5-7"}]},{"heading":"What the justices asked","paragraphs":["Justice Scalia asked if the statute's drafting implies the firearm type is a separate element.","Justice Breyer asked why the Court should not follow its prior interpretation of similar statutory language."],"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 10, lines 3-27","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 10, lines 3-27"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 11, lines 13-25","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 11, lines 13-25"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 15-21","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 15-21"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 29-35","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 29-35"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 41-45","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 41-45"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 43-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 43-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 4, lines 29-39","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 4, lines 29-39"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 4, lines 45-49","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 4, lines 45-49"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 5, lines 25-37","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 5, lines 25-37"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 6, lines 27-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 6, lines 27-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 7, lines 19-23","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 7, lines 19-23"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 7, lines 45-21","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 7, lines 45-21"}]},{"heading":"Why it matters","paragraphs":["This case determines whether defendants face mandatory minimum sentences based on weapon type without a separate jury finding. It clarifies the boundary between criminal elements and sentencing enhancements in federal law."],"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 26, lines 37-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 26, lines 37-7"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 17-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 17-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 19-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 19-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 5-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 5-7"}]},{"heading":"What happens next","paragraphs":["This article currently covers the argument record. Use the official docket link for later case activity."],"sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 10, lines 3-27","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 10, lines 3-27"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 11, lines 13-25","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 11, lines 13-25"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 15-21","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 15-21"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 29-35","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 29-35"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 12, lines 41-45","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 12, lines 41-45"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 43-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 43-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 7-15","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 7-15"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 4, lines 29-39","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 4, lines 29-39"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 4, lines 45-49","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 4, lines 45-49"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 5, lines 25-37","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 5, lines 25-37"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 6, lines 27-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 6, lines 27-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 7, lines 19-23","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 7, lines 19-23"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 7, lines 45-21","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 7, lines 45-21"}]}],"slug":"2009-08-1569-united-states-v-o-brien","term":"2009","title":"Does a machinegun trigger a separate mandatory minimum sentence?","title_sources":[{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 26, lines 37-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 26, lines 37-7"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 3, lines 17-41","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 3, lines 17-41"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 19-1","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 19-1"},{"evidence_type":"Transcript","label":"Official Supreme Court Transcript — file page 9, lines 5-7","official_url":"https://www.supremecourt.gov/pdfs/transcripts/2009/08-1569.pdf","page_label":"file page 9, lines 5-7"}],"topics":[],"undated_disposition_date_fallback":null,"updated_at":"2026-09-05T03:22:24Z"}