After July 1, 2002, state and local government building inspectors, including state safety advisors, shall hold a valid certification as a building inspector or building plans examiner issued by the International Code Council (ICC), except that a building inspector with a valid ICC residential building inspector certification may only inspect structures regulated by the International Residential Code (IRC). A building inspector with a valid ICC residential building inspector certification working under the supervision of an ICC-certified building inspector or building plans examiner may inspect all occupancy classifications for a period not to exceed three (3) years. An inspector may be hired without a valid ICC residential building inspector certification but must obtain such certification within a period of up to six (6) months after hire and must be under the supervision of an ICC-certified building inspector or building plans examiner until such certification is obtained. Until such certification is obtained, no official adverse action may be undertaken without review and approval of an ICC-certified building inspector or building plans examiner.