What is the legal blood alcohol concentration (BAC) limit for drivers over 21 in Montana?

In Montana, the legal blood alcohol concentration (BAC) limit for drivers over 21 is set at 0.08%. This means that any driver whose BAC is 0.08% or higher is considered legally impaired and may be charged with driving under the influence (DUI). This law is in place to promote road safety and reduce the number of alcohol-related accidents.

A BAC of 0.08% is commonly recognized across many states in the United States as the threshold for determining impairment in adult drivers. It reflects the point at which alcohol can significantly affect a person's ability to drive safely, impairing judgment, coordination, and reaction times.

The other BAC levels listed are lower than the legal limit. A BAC of 0.01% or 0.05% may suggest minor alcohol consumption, but they are not recognized as legal limits for impairment. A limit of 0.10%, although it may have been recognized in the past, is now above the current legal standard and would indicate a higher level of impairment, leading to potential legal consequences. Therefore, knowing that the limit is 0.08% helps drivers understand the legal implications of drinking and driving in Montana.