This educational guide is based on the linked primary sources. It is not a Court publication, is not affiliated with the Court, and is not legal advice.
In brief
Overview
Section 4248 is a limited federal civil‑commitment statute.
Background and question before the Court
According to Solicitor General Elena Kagan, Congress enacted Section 4248 under Article I authority as a limited federal civil‑commitment statute.
According to Justice Kennedy, justices asked whether the statutory scheme permits a one‑year federal commitment before the State assumes custody.
According to Justice Scalia, justices questioned what constitutional power allows the federal government to ensure sexually dangerous individuals are not released.
What each side argues
United States (Petitioner)
According to Solicitor General Elena Kagan, the statute is a proper exercise of Congress’s Article I power and fills a transition gap to prevent sexually dangerous, mentally ill individuals from falling through the cracks between federal and state custody.
Graydon Earl Comstock Jr. (Respondent)
According to G. Alan DuBois, the federal government lacks the constitutional authority under the Necessary and Proper Clause to detain individuals beyond their criminal sentence; public health and mental health are traditionally state functions.
What happened at oral argument
Justice Kennedy asked whether the statutory scheme allows a one‑year federal commitment before the State takes over.
According to Justice Scalia, justice Scalia questioned what constitutional power permits the federal government to ensure sexually dangerous individuals are not released.
Justice Ginsburg asked what power the federal government is exercising when it commits someone found not guilty by reason of insanity.
According to Justice Sotomayor, justice Sotomayor raised the issue that a prisoner might be released before a cure for the alleged mental illness is found, limiting supervised release.
What the Court decided
Why it matters
Terms to know
No glossary terms are available for this guide.
Primary sources
Read the source materials on the official site or open the immutable repository copy used for this guide.
- 95d826d819ed47846b9e-r1-8073d5c66b75b4a7.pdforal argument transcript
Guide generated September 23, 2026. Automated validation accepted this version.