In Virginia, drivers 21 years of age or older are presumed to be under the influence of alcohol when their BAC is what level?

In Virginia, drivers who are 21 years of age or older are considered to be under the influence of alcohol when their blood alcohol concentration (BAC) reaches a level of .08%. This legal limit is established to help ensure road safety by identifying when a person's ability to drive may be impaired due to alcohol consumption.

A BAC of .08% signifies that a driver has a level of alcohol in their system that is proven to affect their ability to operate a vehicle safely. This level is widely accepted across many jurisdictions in the United States as the threshold for intoxication for adult drivers.

Other options, such as .10%, .02%, and 1.0, do not represent the legal limit for intoxication in Virginia for this age group. For example, a BAC of .10% is actually a higher threshold that indicates a more severe level of impairment and could lead to more severe legal consequences. A BAC of .02% might be associated with lower levels of intoxication but is not the established legal limit for presumed impairment in this context. The number 1.0 is not a standard BAC measurement, as BAC is typically expressed as a decimal fraction.