Abstract
Breath alcohol testing offers significant advantages over blood alcohol testing. As a result, several million breath alcohol tests are conducted globally each year, mainly for the enforcement of drunk driving laws. The main types of breath alcohol testing instruments are passive alcohol sensors, screening devices, alcohol ignition interlock devices, and evidential breath alcohol instruments. Infrared (IR) spectrophotometry, electrochemical (fuel cells) and dual IR/electrochemical technology, and gas chromatography are the main methods of analysis for breath alcohol. Proper scientific controls such as duplicate breath alcohol testing, air blanks, and calibration checks are necessary to ensure the reliability of evidential breath alcohol testing. The blood to breath alcohol ratio, mouth alcohol effect, and specificity are also presented in this article.
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