Which statement about alcohol concentration is correct?

• A. It refers to grams per breath, blood, or urine as defined by the statute
• B. It is measured by the amount of alcohol per liter of air
• C. It correlates with the number of drinks consumed in an hour
• D. It is the same as blood alcohol content (BAC) no matter the measurement

Answer: (A)

Alcohol concentration in this context is defined by statute as the amount of alcohol in a person’s breath, blood, or urine, expressed in grams of alcohol per the standard unit used for that fluid (for breath, per a breath sample; for blood or urine, per 100 milliliters). This is the precise, legally recognized way to quantify intoxication for offenses. It’s not measured as grams per liter of air, and it doesn’t directly correspond to the number of drinks someone has in an hour because absorption and metabolism vary between individuals. While breath and blood measurements are related, they are different standards and are not interchangeable on a one-to-one basis. So the correct understanding is that alcohol concentration refers to grams per breath, blood, or urine as defined by the statute.