A 58-year-old Janesville man is facing a charge of 5th offense operating while intoxicated. Janesville police say an officer was patrolling downtown a little after 1:00 this morning and noticed a vehicle with expired plates deviating from the lane of traffic. The officer says Authur L. Thomas failed the field sobriety test and admitted to drinking. Thomas was also arrested on a charge of operating after revocation. Thomas was taken to the Rock County jail to await a court hearing.