Would you use a personal breathalyzer to determine if you’re sober enough to drive? It would be a good start in being safe behind the wheel and, potentially avoiding a DUI. But, where they are a good tool, they are not foolproof.
Almost all breathalyzers—whether personal or those used by the police—require calibration to ensure their accuracy. Some may let you, the owner, do the calibration, while others must be sent to the manufacturer. The more you use the device, the more often you’ll have to calibrate it to maintain its accuracy. Even then, there is room for error.
What Do and Don’t They Measure?
Breathalyzers estimate your blood alcohol content or concentration by measuring the amount of alcohol on your breath. They cannot detect if you’ve taken drugs or are extremely tired and unfit to drive.
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