(a) In the formation of a jury, each party shall be entitled to three (3) peremptory challenges, and any deficiencies in the number of jurors summoned, arising from any cause, may be supplied by summoning others in their stead.
(b) In all cases before justices of the peace in this state, it shall be a legal cause for challenge that anyone selected as a juror has served as a juror in a justice's court in the same county within three (3) months prior to the institution of the suit in which the juror is selected.