THere was a guy a farm or 2 over from us when I lived in NC who had multi multiple DUIs, he even got a few while on horseback. He finaly figured out that if the reins werent in his hands he wasnt in controll of the horse. He would ride the horse to the bar, remove the reins and whewn he was done drinking he would tell the horse "Barn" and the horse would take him home.