It's in the California Rules of the Court - here
i) Service of the evaluation report
A Notice Regarding Confidentiality of Child Custody Evaluation Report (form FL-328) must be attached as the first page of the child custody evaluation report when a court-ordered child custody evaluation report is filed with the clerk of the court and served on the parties or their attorneys, and any counsel appointed for the child, to inform them of the confidential nature of the report and the potential consequences for the unwarranted disclosure of the report.
3111. (a) In any contested proceeding involving child custody or
visitation rights, the court may appoint a child custody evaluator to
conduct a child custody evaluation in cases where the court
determines it is in the best interests of the child. The child
custody evaluation shall be conducted in accordance with the
standards adopted by the Judicial Council pursuant to Section 3117,
and all other standards adopted by the Judicial Council regarding
child custody evaluations. If directed by the court, the
court-appointed child custody evaluator shall file a written
confidential report on his or her evaluation. At least 10 days before
any hearing regarding custody of the child, the report shall be
filed with the clerk of the court in which the custody hearing will
be conducted and served on the parties or their attorneys, and any
other counsel appointed for the child pursuant to Section 3150. The
report may be considered by the court.
(b) The report shall not be made available other than as provided
in subdivision (a), or as described in Section 204 of the Welfare and
Institutions Code or Section 1514.5 of the Probate Code. Any
information obtained from access to a juvenile court case file, as
defined in subdivision (e) of Section 827 of the Welfare and
Institutions Code, is confidential and shall only be disseminated as
provided by paragraph (4) of subdivision (a) of Section 827 of the
Welfare and Institutions Code.
(c) The report may be received in evidence on stipulation of all
interested parties and is competent evidence as to all matters
contained in the report.
(d) If the court determines that an unwarranted disclosure of a
written confidential report has been made, the court may impose a
monetary sanction against the disclosing party. The sanction shall be
in an amount sufficient to deter repetition of the conduct, and may
include reasonable attorney's fees, costs incurred, or both, unless
the court finds that the disclosing party acted with substantial
justification or that other circumstances make the imposition of the
sanction unjust. The court shall not impose a sanction pursuant to
this subdivision that imposes an unreasonable financial burden on the
party against whom the sanction is imposed. This subdivision shall
become operative on January 1, 2010.
(e) The Judicial Council shall, by January 1, 2010, do the
(1) Adopt a form to be served with every child custody evaluation
report that informs the report recipient of the confidentiality of
the report and the potential consequences for the unwarranted
disclosure of the report.
(2) Adopt a rule of court to require that, when a court-ordered
child custody evaluation report is served on the parties, the form
specified in paragraph (1) shall be included with the report.
(f) For purposes of this section, a disclosure is unwarranted if
it is done either recklessly or maliciously, and is not in the best
interests of the child.
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