The more food in the stomach, the faster the alcohol absorption process. - Most of the ingested alcohol is absorbed into the small intestine. - About 75% is absorbed into the liver.Alcohol detection tests can measure alcohol in the blood for up to 6 hours, on the breath for 12 to 24 hours, urine for 12 to 24 hours 72 or more hours with more advanced detection methods, saliva for 12 to 24 hours, and hair for up to 90 days,In all states, the legal limit for driving is a blood alcohol concentration of 0.08. If you are at or above this limit, you are considered legally intoxicated. However, it is easy to misjudge your intoxication level,