Bills and Legislation

S. 331

HALT Fentanyl Act

What it does · Congressional Research Service

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. 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.

The “Public Law” summary, Jul 17, 2025. Read it in full on congress.gov.

The record

  • Chamber: U.S. Senate
  • Status: Signed — Signed into law.
  • Sponsor: Sen. Cassidy, Bill [R-LA]
  • Introduced: Jan 30, 2025
  • Latest action: Became Public Law No: 119-26. (Jul 16, 2025)
  • Subjects: Crime and Law Enforcement

Recorded floor votes

  • Passed — On Passage (Jun 12, 2025, 321–104, House)
  • Bill Passed — On Passage of the Bill S. 331 (Mar 14, 2025, 84–16, Senate)
  • Cloture Motion Agreed to — On the Cloture Motion S. 331 (Mar 13, 2025, 84–15, Senate)
  • Cloture on the Motion to Proceed Agreed to — On Cloture on the Motion to Proceed S. 331 (Mar 6, 2025, 82–12, Senate)

Procedural and amendment votes included.

More bills on these subjects

  • S. 307 — Prison Staff Safety Enhancement Act
  • H.R. 9719 — Federal Lands Lawful Carry Act

Data via the ElectedConnect API. Official record.