The Fentanyl Bill, specifically the HALT Fentanyl Act, is a piece of legislation aimed at combating the fentanyl crisis in the United States. The act permanently classifies fentanyl-related substances as Schedule I drugs under the Controlled Substances Act, which means they are considered to have a high potential for abuse, no currently accepted medical value, and are subject to strict regulatory controls. This classification allows law enforcement to more effectively target and prosecute individuals involved in the trafficking and distribution of fentanyl.

The HALT Fentanyl Act also includes provisions that increase criminal penalties for offenses involving fentanyl-related substances, with offenses involving 100 grams or more triggering a 10-year mandatory minimum prison term. Additionally, the bill establishes a new, alternative registration process for certain Schedule I research, making it easier for researchers to conduct studies on fentanyl-related substances.