A Fond du Lac man was arrested over the weekend for his 5th OWI offense. Shortly before 5pm Saturday a State Patrol trooper observed driver impairment and pulled a vehicle over on Interstate 41 near County Highway N. Sixty four year old Leroy Threets was transported to the Fond du Lac County Jail on charges of OWI 5th offense, Operating While Suspended, and Deviation from designated lane.