O.R.C. 4511.19(B) addresses prohibited alcohol level for those under the age of 21. If you are under 21 you cannot have a concentration of .02% but less than .08% by weight of alcohol in your blood, with a concentration of at least .02 grams but less than .08 grams by weight of alcohol per 210 liters of breath, or a concentration of at least.028 grams but less than .14 grams by weight of alcohol per 100 milliliters of urine. This law was meant to address that group of people who have a disproportionately high level of alcohol-related accidents.