Montgomery county law enforcement reports a Red Oak woman was arrested Sunday on a drug offense.  During a traffic stop just before midnight Sunday, June 16 in the 1900 block of Broadway Street in Red Oak, 31-year old Aundrea Theresa Clay of Red Oak was arrested and charged with possession of a controlled substance, 3rd offense.  Clay was taken to the Montgomery County jail and held on $5,000 bond.  Red Oak police and the Montgomery County K-9 assisted.