In Missouri, it is illegal for an adult driver to operate a motor vehicle with a minimum blood alcohol concentration (BAC) of:

In Missouri, it is illegal for a driver age 21 or older to operate a motor vehicle with a BAC of 0.08 percent or more. It is illegal for a driver under the age of 21 to operate a motor vehicle with a BAC of 0.02 percent or more. Being convicted of Driving While Intoxicated (DWI) may result license suspension or revocation.