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Breathometers and breathalyzers are devices designed to estimate the blood alcohol content (BAC) in the human body. The term breathalyzer actually refers to several different types of devices, all of which analyze alcohol concentration by having a subject blow into the machine. Breathalyzer machines use a chemical reaction involving alcohol that produces a color change in proportion to the amount of alcohol in the body. Intoxilyzers detect alcohol content by the use of infrared spectroscopy, whereby BAC is measured based on a calculation of the absorption of infrared light. Alcosensors utilize fuel cell technology to capture BAC through the creation of an electrical current. These devices have typically been used by law enforcement for investigating suspected cases of driving under the influence (DUI) of alcohol. ...

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