The special judge must be a retired or former district court, statutory county court, statutory probate court, business court, or appellate court judge who:
(1) has served as a judge for at least four years in a district court, a statutory county court, a statutory probate court, the business court, an appellate court, or a combination of the preceding courts;
(2) has developed substantial experience in the judge's area of specialty;
(3) has not been removed from office or resigned while under investigation for discipline or removal; and
(4) annually demonstrates completion in the past calendar year of at least five days of continuing legal education in courses approved by the state bar or the supreme court.