When change of venue required

25-2-201 . When change of venue required. The court or judge shall, on motion, change the place of trial in the following cases: (1) when the county designated in the complaint is not the proper county; (2) when there is reason to believe that an impartial trial cannot be had in the current place of trial; (3) when the convenience of witnesses and the ends of justice would be promoted by the change; (4) when a party enters a pleading that challenges, as defined in 25-2-127 , a statute or session law if the statute or session law was enacted or amended within the legislative biennium, as defined in 25-2-127 ; and (5) when a primary bill sponsor intervenes pursuant to 5-2-107 in a declaratory judgment action.