No person shall be eligible to any appointive office unless he or she shall be a bona fide resident of the city at least one (1) year prior to his or her appointment, except that the city may hire nonresident expert employees or appoint nonresidents as a municipal judge or as law enforcement officers when deemed necessary by the board of commissioners, including the appointment of nonresidents who also serve as a municipal judge or law enforcement officers of another municipality or public agency: Provided, That nothing herein shall authorize the appointment of nonresidents of this state.