In Virginia, two breath testing machines are authorized to be used in determining if someone has operated their vehicle under the influence of alcohol. The older machine, Intoxilyzer 5000, uses infrared technology to analyze alcohol content. The newer machine, Intox EC/IR II, uses both infrared and electrochemical technology to analyze alcohol content.
With the Intox EC/IR II, an infrared beam passes over the collected sample. Thereafter, a portion of the breath is introduced to the fuel cell where the result is calculated. The infrared sensor is also used to determine if there is any residual alcohol in the mouth.
Virginia also authorizes numerous devices to be used in preliminary breath tests. The preliminary test results are generally not admissible at trial.
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