Final answer:
For drivers over the age of 21 (not operating a commercial vehicle), it is illegal to drive with a blood alcohol concentration that is 0.08% or more.
Step-by-step explanation:
For drivers over the age of 21 (not operating a commercial vehicle), it is illegal to drive with a blood alcohol concentration that is 0.08% or more. In almost all US states, a blood alcohol level of 0.08% by volume is considered legally dr-unk. Higher levels cause acute intoxication, unconsciousness, and even death.