Cal. Fam. Code § 3118
(a) In any contested proceeding involving child custody or visitation rights, where the court has appointed a child custody evaluator or has referred a case for a full or partial court-connected evaluation, investigation, or assessment, and the court determines that there is a serious allegation of child sexual abuse, the court shall require an evaluation, investigation, or assessment pursuant to this section. When the court has determined that there is a serious allegation of child sexual abuse, any child custody evaluation, investigation, or assessment conducted subsequent to that determination shall be considered by the court only if the evaluation, investigation, or assessment is conducted in accordance with the minimum requirements set forth in this section in determining custody or visitation rights, except as specified in paragraph (1). For purposes of this section, a serious allegation of child sexual abuse means an allegation of child sexual abuse, as defined in Section 11165.1 of the Penal Code, that is based in whole or in part on statements made by the child to law enforcement, a child welfare services agency investigator, any person required by statute to report suspected child abuse, or any other court-appointed personnel, or that is supported by substantial independent corroboration as provided for in subparagraph (B) of paragraph (2) of subdivision (a) of Section 3011. When an allegation of child abuse arises in any other circumstances in any proceeding involving child custody or visitation rights, the court may require an evaluator or investigator to conduct an evaluation, investigation, or assessment pursuant to this section. The order appointing a child custody evaluator or investigator pursuant to this section shall provide that the evaluator or investigator have access to all juvenile court records pertaining to the child who is the subject of the evaluation, investigation, or assessment. The order shall also provide that any juvenile court records or information gained from those records remain confidential and shall only be released as specified in Section 3111.
(b) The evaluator or investigator shall, at a minimum, do all of the following:
(6) File a confidential written report with the clerk of the court in which the custody hearing will be conducted and which shall be served on the parties or their attorneys at least 10 days prior to the hearing. On and after January 1, 2021, this report shall be made on the form adopted pursuant to subdivision (i). This report may not be made available other than as provided in this subdivision. This report shall address the safety of the child and shall include, but not be limited to, the following: