The main purpose of this legislation, known as the Fairness in Fentanyl Sentencing Act of 2025, is to amend existing laws related to the control and sentencing of offenses involving fentanyl and similar substances. The goal is to adjust the penalties for these offenses, making them more proportionate to the actual quantities involved, and to enhance efforts to prevent the illegal importation of these drugs into the United States. Key provisions of the legislation include significant changes to the penalties for fentanyl-related offenses.