Criminal Offenses - As enacted, decreases from 0.20 to 0.15 percent the minimum weight of alcohol concentration in a defendant's blood or breath as an element of the offense of aggravated vehicular assault and in a defendant's blood as an element of the offense of aggravated vehicular homicide. - Amends TCA Title 39, Chapter 13.

SB 457 lowers the blood alcohol concentration (BAC) threshold for aggravated vehicular assault and homicide in Tennessee. It reduces the required BAC level from 0.20% to 0.15% for these offenses, making it easier to prove these crimes in court. The bill directly affects drivers charged with serious alcohol-related offenses under Tennessee Code Annotated Sections 39-13-115 (aggravated vehicular assault) and 39-13-218 (aggravated vehicular homicide). The change takes effect July 1, 2025, and applies to all cases filed on or after that date. This is a substantive policy adjustment to the legal definition of these crimes, not a procedural or commemorative measure.