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A breathalyzer uses any of the established mechanisms (paper catch or a infrared beam) developed to measure the amount of ethanol in a drinker's breath and use that information to calculate a reasonably-accurate BAC (blood alcohol content).

They are used to provide a reasonable measure of the level of intoxication and may be used by law enforcement to catch people that may be committing DUI/DWI (driving under intoxication/driving while intoxicated)

However, in certain jurisdictions, breathalyzers manufactured for consumer use or for law enforcement may not necessarily be admissible in court.

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Q: Principles of alcohol breathalyzers
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Can drugs be detected on a breathalyzer?

Breathalyzers used by the police department detect alcohol, and nothing but alcohol.


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