The laws for Driving Under the Influence (DUI) are different for minors than they are for adults. An adult who is legally able to drink (21 years of age or older) has a limitation of 0.08% Blood Alcohol Concentration (BAC) before it is considered a crime.
Over the years and through your various outings with friends, you likely noticed that alcohol affects people differently. You may have seen a friend consume only a small amount of alcohol and act very unlike his or her usual self while also watching another individual consume drink after drink without showing the slightest sign of impairment. This type of scenario happens quite often as many different factors can impact how alcohol affects a person.