Notwithstanding any other provision of law and in addition to any other requirements, in any child custody proceeding:
1. Each petitioner and every other person otherwise required by the court or by any applicable law shall:
(a) Determine whether there is reason to know that the child is an Indian child; and
(b) Demonstrate to the court that he or she made efforts to determine whether a child is an Indian child.
2. The court shall:
(a) Make a finding regarding whether there is reason to know that the child is an Indian child, unless the court has previously found that the child is an Indian child; and
(b) Not enter a custody order in the matter until all applicable inquiry and notice requirements set forth in this chapter have been met.