Breath Alcohol Testing Overview

Missouri’s implied consent law requires a driver to submit to a chemical breath alcohol test when arrested for DWI.

Missouri Law provides that any person who operates a motor vehicle in Missouri is deemed to have given consent to a chemical test or tests of the person’s breath, blood, saliva or urine for the purpose of determining the alcohol or drug content of the person’s blood. Visit our Breath Alcohol Testing page to learn more about the Intoxilyzer 5000 and DataMaster breath alcohol testing machines and other issues relating to the law and science of breath alcohol testing in Missouri.

What amount of alcohol consumption relates to what level of blood alcohol content? Visit our Alcohol Impairment Charts page to find out.

Refuse to submit to breath alcohol testing? Visit our Chemical Test Refusal page to learn about what happens if you “refused to blow” and did not submit to a breath alcohol test after being arrested for DUI / DWI.