Alcohol can have serious health effects and legal consequences, especially for teens. Even one drink can impair brain function and decision making. The liver can only process one drink per hour, so excess alcohol stays in the bloodstream. For teens, urination, perspiration and respiration remove alcohol at a rate of one drink every two hours. As blood alcohol concentration increases, motor skills, judgment, speech and reaction time become impaired. Above a BAC of 0.08%, individuals are considered legally intoxicated, and higher levels can cause unconsciousness or even death.