The detrimental effects on the central nervous system increase as a person’s blood alcohol levels rise. Alcohol is directly absorbed via the stomach and small intestine walls. After that, it enters the bloodstream and builds up there before being digested by the liver. The amount of alcohol in a specific volume of blood is used to calculate a person’s blood alcohol content. This is known as BAC, or Blood Alcohol Concentration. Crash risk skyrockets with a blood alcohol concentration (BAC) of.08 grams per deciliter (g/dL). Because of this risk, driving while intoxicated is prohibited in all 50 states, the District of Columbia, and Puerto Rico, with the exception of Utah, where the BAC limit is.05.