Which method is used to determine blood alcohol content in a living subject?

• A. Breathalyzer.
• B. Mantoux Test.
• C. Dick Test.
• D. Inspect the Size of the Pupils.

Answer: (A)

Measuring blood alcohol content in a living person is done with a breathalyzer. This device analyzes a sample of the person’s exhaled breath to estimate how much alcohol is in the blood. Since ethanol in the blood distributes into the lungs, the concentration in breath reflects the blood level, allowing a quick, noninvasive BAC reading.

The other options don’t measure BAC: Mantoux and Dick tests are skin tests for immune responses to certain toxins or bacteria, not for alcohol content. Inspecting pupil size relates to neurological or drug effects but doesn’t quantify alcohol in the bloodstream. So the breathalyzer is the method that provides the BAC value in a living subject.