04/01/2026
Police use handheld devices called breathalyzers (or breathalysers, alcohol testers/analysers) to quickly estimate a driver's Blood Alcohol Content (BAC) from their breath, with common brands like Dräger Alcotest being popular, while more precise machines like the Intoxilyzer are used at stations for evidence, both working by detecting ethanol in breath samples to check for drunk driving.