Connecticut refers to drinking and driving related convictions as an OUI or operating under the influence. You can be arrested for an OUI if you have a blood alcohol concentration (BAC) of .08% or greater. An OUI arrest is a serious drunk driving crime that will result in fines and penalties as outlined below. Legal limit in Connecticut: Standard, non-commercial drivers: 0.08% BAC Commercial drivers: 0.04% BAC Drivers under 21: 0.02% BAC Penalties, Fines, & Suspension Connecticut OUI Penalties, Fines, & Suspension Penalty 1st offense