How Does a Breathalyzer Work in a Car?
Understanding how does a breathalyzer work in a car is essential for motorists required to install an Ignition Interlock Device (IID) following a DUI/DWI conviction, as well as fleet managers exploring vehicle alcohol safety systems. A car breathalyzer is a sophisticated electronic testing unit hardwired directly into a vehicle's starter ignition circuit. By measuring deep-lung alveolar breath alcohol concentration (BrAC) using electrochemical fuel cell sensors, the device acts as a physical security gatekeeper, preventing the vehicle from starting if detectable alcohol is measured.