1. (a) The court may not modify a child custody order unless:

   1. (1) the modification is in the best interests of the child; and
   2. (2) there is a substantial change in one (1) or more of the factors that the court may consider under section 8 and, if applicable, section 8.5 of this chapter.
2. (b) In making its determination, the court shall consider the factors listed under section 8 of this chapter.

3. (c) The court shall not hear evidence on a matter occurring before the last custody proceeding between the parties unless the matter relates to a change in the factors relating to the best interests of the child as described by section 8 and, if applicable, section 8.5 of this chapter.

   [Pre-1997 Recodification Citation: 31-1-11.5-22(d), (e), (f).]

As added by P.L.1-1997, SEC.9. Amended by P.L.96-1999, SEC.9.