The purpose of the second test when there is a failure is to account for "mouth alcohol" which can cause an incorrect test reading. Thus, if the operator blows a second time in 5 minutes and passes, the first test failure is disregarded as a probable error based on mouth alcohol. Mouth alcohol can be caused by a lot of things like gum, toothpaste, mouthwash and some medications, which is why the rules provide for a second test and there is no way you could lose that much alcohol in 5 minutes between the failure and the pass.
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