The **breath alcohol test** is primarily conducted through the **verification of exhaled air** using a device called a **breathalyzer**. This device measures the amount of alcohol present in the air a person exhales, allowing the determination of their blood alcohol level.

- When a driver is stopped by a traffic officer and is suspected of having consumed alcohol, they are asked to blow into the breathalyzer. If the result is positive, the test is repeated to confirm the result.
- This test is the most common and quickest way to detect alcohol consumption in drivers, as it provides immediate results and is less invasive than other methods such as blood or urine tests.
- If the driver disagrees with the breathalyzer result, they can request a blood test to verify the results, but this is not part of the standard procedure.

Therefore, the verification of exhaled air using breathalyzers is the usual method for conducting the alcohol test.