DUI Offenses - As enacted, lowers the threshold for enhancing the minimum sentence of a person convicted of driving under the influence of an intoxicant, from a blood alcohol concentration of 0.20 percent or more to a blood alcohol concentration of 0.15 percent or more. - Amends TCA Title 39, Chapter 13; Title 55, Chapter 10, Part 4 and Title 69, Chapter 9, Part 2.