The Breath Alcohol Detector is intended to measure alcohol in the human breath. Results are used in the diagnosis of alcohol intoxication. The Breath Alcohol Detector is a semi-quantitative, rapid screening test. It indicates relative Blood Alcohol Concentration (BAC) at 0.02% and 0.08% cut-off levels. Each detector contains crystals that detect a specific cut-off level of BAC. The test is based on a chemical reaction. Alcohol reacts with the crystals in the detector to produce a color change from yellow to green or blue. The color change depends on the amount of alcohol in the breath. If the test is positive, the amount of alcohol in the breath is greater than or equal to the cut-off level of the detector.

Two BAC (Blood Alcohol Concentration) Levels are available: 0.02% BAC and 0.08% BAC. The 0.02% BAC Breathalyzer test uses the lowest cutoff level, meaning it is the most sensitive to alcohol. This is a better option for a zero-tolerance testing scenario. The 0.08% BAC Breathalyzer test uses the same cutoff level that most US states consider the legal limit for DUI (Driving Under the Influence).