MS HB253

120-day license suspension periods for DUI violations now begin on the date the judge signs the suspension order, rather than from a later administrative date

Establishes an aggravated DUI penalty specifically for underage drivers (below legal drinking age) who have a blood alcohol concentration of 0.08% or higher and cause death, mutilation, or serious injury to another person

Underage offenders convicted of aggravated DUI before July 1, 2023, with BAC below 0.08% may petition for a new trial under the revised standards

Maintains existing DUI thresholds: 0.08% BAC for adults, 0.02% BAC for minors (Zero Tolerance), and 0.04% BAC for commercial vehicle operators

Bill contains a repealer clause setting expiration on June 30, 2023, effectively making it expire the same day it would take effect (July 1, 2023)