Final answer:
In Ohio, underage drivers are considered to be driving under the influence with a BAC of 0.02% or higher, which is lower than the general legal limit of 0.08% for drivers 21 and over.
Step-by-step explanation:
In Ohio, if you are under 21 years of age, you are considered to be driving under the influence if you have a blood alcohol concentration (BAC) of 0.02% or higher. The state has set a lower BAC limit for underage drivers compared to the general legal limit, which is 0.08% for drivers 21 and over. It is important for all drivers, especially those under 21, to understand that any amount of alcohol can impair driving abilities and can lead to DUI charges with serious consequences.