If you’re worried about a breathalyzer, you might ask, “How long does alcohol stay in your system for a breath test?” In most cases, alcohol is detectable on your breath for up to 24 hours after your last drink.
How Long Does Alcohol Stay in Your System – Breathalyzers
Breathalyzers measure blood alcohol concentration (BAC) by analyzing the alcohol content in your breath. Your BAC rises quickly after drinking, usually peaking within 30 to 90 minutes. From there, it declines as your liver processes the alcohol.
Several factors influence How Long Does Alcohol Stay in Your System detectable: your weight, sex, how fast you drank, and what you ate. A large meal slows absorption, while drinking quickly on an empty stomach can raise your BAC fast.
see more: How Long Does Alcohol Stay in Your System for a Urine Test?
Even if you “feel fine,” alcohol can still show up in a breath test. It’s safest to wait at least 12–24 hours after drinking before driving or operating machinery.