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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).
4 doctors agreed: Yes for some tests: Also it will depend on for what length of time and how much you are drinking. A blood alcohol level will show alcohol content of blood recently consumed. But a complete blood count will have indicators of changes in red blood cells as a result of chronic alcohol use.