HALT Fentanyl Act
Summary
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.
Bill status
signed
all 5 stages cleared
Introduction
Jan 2025
Committee Review
Jun 2025
Senate Passage
Mar 2025
House Passage
Jun 2025
Signed into Law
Jul 2025
Introduced Jan 30, 2025
Signed Jul 16, 2025
Floor votes · Senate Mar 14, 2025 · House Jun 12, 2025
How they voted
84–16
Passed
Total votes 100
Mar 14, 2025
D
Democratic45
66% Yea
I
Independent2
50% Nay
R
Republican53
100% Yea
Vote distribution
All Yea
All Nay
Mixed
No data
Full legislative history
Actions timeline
Total actions
38
Key actions
10
Committee
5
Jul 16, 2025
Signed into law
Signed by President.
executive
Jun 12, 2025
Lower · Passed
On passage Passed by the Yeas and Nays: 321 - 104 (Roll no. 166). (text: 6/11/2025 CR H2625-2627)
lower
Jun 12, 2025
Lower · Passed
Passed/agreed to in House: On passage Passed by the Yeas and Nays: 321 - 104 (Roll no. 166). (text: 6/11/2025 CR H2625-2627)
lower
Jun 10, 2025
Lower · Passed
Rule H. Res. 489 passed House.
lower
Jun 9, 2025
Lower · Passed
Rules Committee Resolution H. Res. 489 Reported to House. Rule provides for consideration of H.R. 884, H.R. 2056, H.R. 2096 and S. 331. The resolution provides for consideration of H.R. 884, H.R. 2056, H.R. 2096, and S. 331 under a closed rule with one hour of general debate for each bill. The resolution provides for one motion to recommit on H.R. 884, H.R. 2056, and H.R. 2096, and one motion to commit on S. 331.
lower
Mar 14, 2025
Upper · Passed
Passed Senate with an amendment by Yea-Nay Vote. 84 - 16. Record Vote Number: 127.
upper
Mar 14, 2025
Upper · Passed
Passed/agreed to in Senate: Passed Senate with an amendment by Yea-Nay Vote. 84 - 16. Record Vote Number: 127.
upper
Mar 14, 2025
Upper · Passed
The committee substitute agreed to by Unanimous Consent.
upper
Mar 3, 2025
Upper · Passed
Committee on the Judiciary. Reported by Senator Grassley with an amendment in the nature of a substitute. Without written report.
upper
Feb 27, 2025
Upper · Passed
Committee on the Judiciary. Ordered to be reported with an amendment in the nature of a substitute favorably.
upper
Jan 30, 2025
Committee
Read twice and referred to the Committee on the Judiciary.
upper
Jan 30, 2025
Introduced
Introduced in Senate
upper
1 primary · 31 co-sponsors
Sponsors
Role
Legislator
Party
State
District
P
Bill Cassidy
RRepublican
Co
Angus S. King, Jr.
IIndependent
Co
Ashley Moody
RRepublican
Co
Catherine Cortez Masto
DDemocratic
Co
Chuck Grassley
RRepublican
Co
Cindy Hyde-Smith
RRepublican
Co
Dan Sullivan
RRepublican
Co
David McCormick
RRepublican
Co
Eric Schmitt
RRepublican
Co
James C. Justice
RRepublican
Co
Jeanne Shaheen
DDemocratic
Ask Maddy
·
AI policy assistant
Ask Maddy about S 331
Scope: US
Hi! I can help you understand S 331. What would you like to know?
Try one of these
i
Maddy answers using official bill text and legislative records. Always verify before sharing.
Sources cited inline