Here is the California Court of Appeals (3rd Dist.) opinion in R.R. v. Superior Court. An excerpt:
We disagree with the juvenile court’s conclusion. While ICWA may not by its own terms apply to a juvenile delinquency case in which the case plan anticipates foster care placement, the California Legislature has expressly made the inquiry and notice requirements of ICWA applicable in such cases, and impliedly made the remaining ICWA requirements applicable in such cases as well. Because ICWA sets the minimum standards for the protection of Indian children with respect to their tribal relationships, California law imposing a higher standard is not inconsistent with the purpose of the federal law, and is not preempted.