What exactly does a breathalyzer measure?

A breathalyzer gives an estimate of your blood alcohol content (BAC).

Blood Alcohol Content (BAC) describes the percentage of alcohol present in the blood. BAC testing enables law enforcement and medical professionals--as well as concerned individuals--to objectively estimate the level of a person’s alcohol intoxication. Put simply, the higher the BAC number, the greater the impairment.
To  learn more about BAC, click the link below.
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