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Missouri’s DWI laws prohibit all motorists from operating or being in “actual physical control” of a motor vehicle:
  • + with an excessive blood alcohol concentration (BAC), or
  • + while in an intoxicated condition—being under the influence of any combination of alcohol or drugs.

Excessive blood concentration. Any BAC of at least .08% is considered excessive. The BAC threshold is reduced to .04% if the licensee is driving a commercial vehicle. And Missouri has underage DWI laws that prohibit motorists who are under 21 years old from driving with a BAC of .02% or more.

The amount of alcohol a person must drink to reach the legal limit depends on a number of individual factors.

  1st Offense 2nd Offense 3rd Offense
Up to 6 months
Up to 1 year Up to 4 years

Up to $1,000
Up to $2,000 Up to $10,000
License Suspension
30 days, then 60-day restricted license
5-year revocation 10-year revocation
Ignition Interlock Device
Possible as a condition of restricted license
6 months minimum 6 months minimum