Mich. Admin. Code R. 431.3045
Rule 3045. If required by the executive director, 3 racing officials shall serve as placing judges and shall be in a stand directly above the finish line during the running of each race. The placing judges shall take special note of racing colors and distinguishing equipment carried by each horse. The placing judges shall determine the order of the horses as they cross the finish line by considering the location of the respective noses of such horses. The placing judges shall cause the numbers of the first 4 horses to cross the finish line to be flashed on the result board. A photo finish camera approved by the executive director shall be used as an aid by the placing judges in determining the order of the horses as they cross the finish line. Placing judges may request a photo to assist in determining margins of less than a 1/2 however, the camera and any photographic reproduction are merely aids to the placing judges.
Mich. Admin. Code R. 431.3045