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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).
It may also be done as part of an application for life insurance. These uses are considered legal alcohol tests because they require chain-of-custody documents. Samples tested for legal purposes may include blood, breath, urine, and/or saliva. Breath testing is the most common test performed on drivers. It uses a conversion factor to estimate the amount of alcohol in the blood.