A chemical test is used to measure:
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Vision.
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Blood Alcohol Content (BAC).
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Driving ability.
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Perception time.
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Explanation
Chemical tests, including breathalyzer, blood, and urine tests, measure your BAC level. If a police officer pulls you over and asks you to take one of these tests, you are required by law to cooperate.
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Other questions in the same category: Alcohol and Drug Effects on Driving
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