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1 Hair alcohol tests detect alcohol use over a longer period of time than any other type of alcohol testing protocol (for instance, hair tests for alcohol can provide accurate test results regarding alcohol use going back months or even years).
Breath analysis is the most common method in determining a person's breath-alcohol-concentration (BrAC). The Department of Transportation has determined that many breathalyzers, when meeting DOT guidelines are able to be used in the screening of alcohol to determine an individual's blood-alcohol-concentration (BAC).