Find references for below statement: In New York, the Blood Alcohol Concentration (BAC) is a measure of the amount of alcohol in a person's bloodstream. It is typically measured as weight per unit of volume. In the United States, this is usually expressed as a percentage, such as 0.08%, which means 0.08 grams of alcohol per 100 milliliters of blood. The legal BAC limit varies depending on the driver's age and type of vehicle being driven. In New York City, the legal BAC limit is set by New York State law. The limit is lower for commercial drivers and drivers under 21 to promote safety, as these groups may be more susceptible to the effects of alcohol