NHTSA has been working with the Automotive Coalition for Traffic Safety (ACTS), an industry group, since 2008 on systems to discretely detect alcohol on drivers’ breaths or in their blood. The Driver Alcohol Detection System for Safety project has been testing sensors in recent years, including with a Virginia transportation company, and hopes to have a road-ready approach by 2024.

Source: https://www.washingtonpost.com/transportation/2021/11/09/drunk-driving-technology-infrastructure/