Fuel cell breathalyzer uses one of the most advanced methods to determine human BAC ( Blood Alcohol Concentration). A fuel cell measures alcohol concentration by a chemical reaction through platinum metal which oxidizes the alcohol in the sample and produces an electrical current. A Fuel Cell breathalyzer is more specific for ethyl alcohol and avoids the false readings from substance like ketones having similar chemical structure as alcohol.  Therefore, fuel cell breathalyzer is of high accuracy and stability.