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

The legal blood alcohol content (BAC) limit for drivers over 21 in Montana is set at 0.08%. This means that a driver is legally intoxicated if their BAC is at or above this percentage. The establishment of this limit is based on research that correlates higher BAC levels with an increased risk of impaired driving and accidents.

A BAC of 0.08% indicates that there are 0.08 grams of alcohol for every 100 milliliters of blood. At this level, most drivers may start to experience impaired judgment, decreased coordination, and reduced reaction time, which can significantly affect their driving ability.

This standard is consistent with many other states in the U.S. and is essential for maintaining road safety. Lower BAC thresholds, such as 0.05%, are often applied in certain jurisdictions for commercial drivers or for drivers under certain circumstances, but for the general population over 21 years old in Montana, the 0.08% limit is the law.