Sensors installed in either the door trim or the steering column can pass or fail the driver after he exhales into the sensor. The vehicle provides a pass/fail reading and, based on that result, allows the driver to proceed or not.
Algorithms will be able to detect ethanol in the driver’s breath compared to carbon dioxide. A detector then measures how much infrared radiation of a particular wavelength is captured by the surrounding air. Based on this measurement, the device can calculate the concentration of ethyl alcohol.
Even if Asahi Kasei doesn’t serve as a Tier 1 supplier to global automakers, its technology probably finds its way into vehicles through other components made by more traditional auto parts makers.
https://carbuzz.com/news/automakers-are-scrambling-to-develop-alcohol-detection-tech-for-new-cars Automakers are busy developing alcohol detection technology for new cars