A chemical test is used to:

Measure the concentration of alcohol or drugs in a driver's blood, breath, or urine.
Check for evidence of certain drugs, including alcohol, from a driver's blood sample.
Determine a driver's BAC (blood alcohol content).
All of the above.
Explanation

A chemical test is used to measure a driver's blood alcohol content (BAC) or detect the presence of drugs. These tests can be performed using a sample of the driver’s breath, blood, or urine. If the test shows a BAC at or above the legal limit (typically 0.08% in most states), the driver can be charged with driving under the influence (DUI). Chemical test results are often used as evidence in court.

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