A breath alcohol test determines how much alcohol is in your blood by measuring the amount of alcohol in the air you breathe out (exhale).
Alcohol test - breath
There are various brands of breath alcohol tests. Each one uses a different method to test the level of alcohol in the breath. The machine may be electronic or manual.
One common manual tester requires you to blow up a balloon in one continuous breath until it is full, then release the...
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Source: ADAM Encyclopedia
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