Indiana has various laws that punish drivers who are driving under the influence of substance that could affect their ability to operate a vehicle. You will be subject to a OWI or operating while intoxicated charge if found guilty of driving with a BAC (blood alcohol concentration) of .02%. Punishments will increase severely if found guilty of driving with a BAC of .15% or greater. Legal limit in Indiana: Standard, non-commercial drivers: .08% BAC Commercial drivers: .04% BAC Drivers under 21: .02% BAC Penalties, Fines,