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119th Congress · 2025–2027
S. 331

Halt All Lethal Trafficking of Fentanyl Act

Crime and Law Enforcement Senate 31 cosponsors
Latest action: Became Public Law No: 119-26. · July 16, 2025
Understand the measure

What this bill does

Congressional Research Service · Official summary · Last checked November 3, 2026

Summary for Public Law

July 17, 2025 · Summary last updated January 27, 2026

This summary matches the official status record for the bill, but that record does not prove which version of the text it covers. A matching date alone is not proof.

Halt All Lethal Trafficking of Fentanyl Act or the HALT Fentanyl Act

This act permanently places fentanyl-related substances as a class into schedule I of the Controlled Substances Act. A schedule I controlled substance is a drug, substance, or chemical that has a high potential for abuse; has no currently accepted medical value; and is subject to regulatory controls and administrative, civil, and criminal penalties under the Controlled Substances Act.

Read the complete summary

Under the act, offenses involving fentanyl-related substances are triggered by the same quantity thresholds and subject to the same penalties as offenses involving fentanyl analogues (e.g., offenses involving 100 grams or more trigger a 10-year mandatory minimum prison term).

Additionally, the act establishes a new, alternative registration process for certain schedule I research.

The act also makes several other changes to registration requirements for conducting research with controlled substances, including

  • permitting a single registration for related research sites in certain circumstances,
  • waiving the requirement for a new inspection in certain situations, and
  • allowing a registered researcher to perform certain manufacturing activities with small quantities of a substance without obtaining a manufacturing registration.

Finally, the act expresses the sense that Congress agrees with the interpretation of the Controlled Substances Act in United States v. McCray, a 2018 case decided by the U.S. District Court for the Western District of New York. In that case, the court held that butyryl fentanyl, a controlled substance, can be considered an analogue of fentanyl even though, under the Controlled Substances Act, the term controlled substance analogue specifically excludes a controlled substance.

Other summary versions on file (1)
  • Introduced in Senate · January 30, 2025

Read these versions at Congress.gov using the source link below.

01
The measure

The official bill title and text published by Congress and GovInfo.

02
The movement

Every committee, chamber, and clerk-recorded action attached to its date.

03
The votes

Every roll call on this measure, or a notice when no individual vote exists.

Where it stands

The measure's progress

Public Law 119-26

Became Public Law No: 119-26.

Recorded July 16, 2025, as the clerk wrote it

Sponsor Sen. Cassidy, Bill [R-LA]
Committee Judiciary Committee
Recorded votes 4 on this measure
The official record
Cite this record
Reference number
bill-119-s331
Official source
Congress.gov ↗
Last checked
Status and actions last read from the official GovInfo BILLSTATUS record
AP style

Power & Politics, "S. 331 (119th Congress): Halt All Lethal Trafficking of Fentanyl Act," last checked Oct. 11, 2026, citing Congress.gov, https://powerandpolitics.co/cite/bill-119-s331

APA

Power & Politics. (2026, October 11). S. 331 (119th Congress): Halt All Lethal Trafficking of Fentanyl Act [Bill record]. Retrieved November 5, 2026, from https://powerandpolitics.co/cite/bill-119-s331

Chicago

Power & Politics. "S. 331 (119th Congress): Halt All Lethal Trafficking of Fentanyl Act." Last modified October 11, 2026. Accessed November 5, 2026. https://powerandpolitics.co/cite/bill-119-s331.

BibTeX
@misc{votefiles_bill_119_s331,
  author       = {{Power & Politics}},
  title        = {{S. 331 (119th Congress): Halt All Lethal Trafficking of Fentanyl Act}},
  year         = {2026},
  howpublished = {\url{https://powerandpolitics.co/cite/bill-119-s331}},
  note         = {Reference number bill-119-s331; official source: Congress.gov, https://www.congress.gov/bill/119th-congress/senate-bill/331; last checked October 11, 2026; accessed November 5, 2026}
}
Plain link

https://powerandpolitics.co/cite/bill-119-s331

Cite the official source for the underlying fact. Power & Politics reference number never changes for this record. AP, APA and Chicago are standard citation styles for news and academic writing, and BibTeX is the format reference-manager programs read.

Official analyses

CBO cost estimates and CRS reports on S. 331

Published August 26, 2025Illicit Fentanyl and Mexico’s Role (PDF)
CRS · Resources · IF10400

Listed only where the Congressional Budget Office names this bill number in its estimate's title and that title matches the bill's own, or where the Congressional Research Service lists this bill among a report's related materials. Titles and dates are the publishers' own. All watchdog and scorekeeper reports