A 34-year-old Janesville man is facing charges of 4th offense Operating While Intoxicated after an arrest overnight. The Rock County Sheriff's office says Adrian Flores failed a field sobriety test after being pulled over a little before midnight . Authorities say his blood alcohol concentration was .18, or more than double the legal limit. He was also cited on a charge of operating after revocation. After being booked into the Rock County Jail, he was released to a responsible party.