S. 331 — 119th Congress

HALT Fentanyl Act

Originated in the Senate · Introduced Jan 30, 2025 · Crime and Law Enforcement

Latest action

Jul 16, 2025

Became Public Law No: 119-26.

CRS summary

As of Jul 17, 2025

Public Law

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.

Congressional Research Service, via api.congress.gov (public domain)

Roll-call votes

4 on record
DateChamberQuestionMember pagesResult
Jun 12, 2025HouseOn Passage119th CongressPassed (321–104)
Mar 14, 2025SenateOn Passage of the Bill119th CongressBill Passed (84–16)
Mar 13, 2025SenateOn the Cloture Motion119th CongressCloture Motion Agreed to (84–15)
Mar 6, 2025SenateOn Cloture on the Motion to Proceed119th CongressCloture on the Motion to Proceed Agreed to (82–12)

Member pages currently show roll-call votes from the 119th Congress only. The “Member pages” column marks votes from that congress.