Criminal procedure: sentencing guidelines; sentencing guidelines for illicit use of xylazine; provide for. Amends sec. 13m, ch. XVII of 1927 PA 175 (MCL 777.13m).

HB 4167 amends Michigan's sentencing guidelines to specifically address the illicit use of xylazine, a veterinary drug increasingly misused in illicit drug mixtures. The bill adds xylazine to the list of substances covered under sentencing guidelines (MCL 777.13m), meaning courts must now apply standardized sentencing ranges for convictions involving its unauthorized possession or use. This directly affects individuals convicted of xylazine-related offenses, including those using it alone or combined with other drugs. The change creates a clear, defined sentencing path for this specific offense, moving beyond general drug sentencing rules to address xylazine's growing public health impact. The bill was introduced on March 5, 2025, and referred to the Judiciary Committee.