At what Blood Alcohol Content (BAC) does the law state you are under the influence of alcohol?

Correct answer

  • 0.08 percent
  • 0.10 percent
  • 0.04 percent


In Montana, a BAC of .08 is conclusive evidence that a driver is under the influence. However, a driver can be charged with driving under the influence if the BAC is under .08. Remember, you can be arrested for driving with a blood alcohol concentration (BAC) of 0.08% or more, OR while driving under the influence. More stringent rules apply to those under 21 years of age and drivers operating a commercial motor vehicle.

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