California Code, Welfare and Institutions Code - WIC § 224.6

(a) When testimony of a “qualified expert witness” is required in an Indian child custody proceeding, a “qualified expert witness” shall be qualified to testify regarding whether continued custody of the child by the parent or Indian custodian is likely to result in serious emotional or physical damage to the child and shall be qualified to testify to the prevailing social and cultural standards of the Indian child's tribe. A person may be designated by the child's tribe as qualified to testify to the prevailing social and cultural standards of the Indian child's tribe. The individual may not be an employee of the person or agency recommending foster care placement, preadoptive placement, adoptive placement, adoption, or termination of parental rights.

(b) In considering whether to remove an Indian child from the custody of a parent or Indian custodian or to terminate the parental rights of the parent of an Indian child, the court shall do both of the following:

(c) Persons with the following characteristics are most likely to meet the requirements for a qualified expert witness for purposes of Indian child custody proceedings:

(d) The court or any party may request the assistance of the Indian child's tribe or Bureau of Indian Affairs agency serving the Indian child's tribe in locating persons qualified to serve as expert witnesses.

(e) The court may accept a declaration or affidavit from a qualified expert witness in lieu of testimony only if the parties have so stipulated in writing and the court is satisfied the stipulation is made knowingly, intelligently, and voluntarily.