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Breath Analyzer

Posted on:3/3/2013
The police use the breath analyzer, a portable alcohol detector to determine whether motorists have been drinking and, if so, whether the amount drunk has caused a blood-alcohol concentration (BAC) greater than the allowed limit.

The legal limit across the United States is 0.08%. Just because the breath analyzer result shows your BAC at 0.08% or more, it does not necessarily mean that your are guilty of DUI as charged. An experienced DUI attorney can challenge the breath analyzer results.


A breathalyzer kit consists of a mouthpiece, a sealed transparent glass tube containing a mixture of chemicals, and an inflatable bag. For use, the ends of the tube are broken off, the mouthpiece attached to one end, and the bag to the other. The test subject is instructed to take a deep breath and blow through the tube until the bag is fully inflated. The bag controls the sample size, so the amount of alcohol in the sample is converted into a concentration. Any alcohol in the breath is oxidized by the chemicals in the tube, which change color as they react. The amount of alcohol in the breath determines how far down the tube the color change extends, so it is possible to estimate roughly the amount of alcohol exhaled and, therefore, the BAC.


If you have been charged with BAC because your breath analyzer result showed your BAC was 0.08% or more, contact an experienced DUI attorney. A significant percentage of drivers who had failed the breathalyzer test were subsequently found to be below the legal limit in more accurate laboratory tests for body alcohol using either blood or urine samples.

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