Here is the opinion in In the Interest of A.P. and S.T. From the opinion:

The Sac and Fox Tribe of the Mississippi in Iowa (Tribe) appeals from the juvenile court‟s denial of its motion to intervene in children in need of assistance (CINA) proceedings that involve two children it alleges are Indian children within the meaning of Iowa‟s Indian Child Welfare Act (Iowa ICWA), Iowa Code chapter 232B (2007). Upon our review, we affirm the judgment of the juvenile court