The First Step Implementation Act of 2025 aims to reform sentencing laws and improve correctional institutions in the United States, particularly focusing on drug offenses and juvenile offenders. The legislation seeks to address the challenges of sentencing for drug-related crimes, especially for juveniles, while enhancing the accuracy of federal criminal records. Key provisions include allowing courts to impose reduced sentences for certain drug offenses committed before December 2018, based on updated standards from the First Step Act of 2018.