Tennessee has very strict drinking driving laws that come with severe punishments, especially if the drunk driving incident resulted in injury or death. In Tennessee, you can be convicted of a DUI or driving under the influence if your blood alcohol concentration (BAC) is .08% or greater. A DUI is considered a crime that not only includings misuse of alcohol while operating a vehicle but driving under the influence of controlled substances and drugs as well. Legal limit in Tennessee: Standard, non-commercial drivers: .08% BAC