California Code, Penal Code - PEN § 11166.3

(a) The Legislature intends that in each county the law enforcement agencies and the county welfare or probation department shall develop and implement cooperative arrangements in order to coordinate existing duties in connection with the investigation of suspected child abuse or neglect cases.  The local law enforcement agency having jurisdiction over a case reported under Section 11166 shall report to the county welfare or probation department that it is investigating the case within 36 hours after starting its investigation.  The county welfare department or probation department shall, in cases where a minor is a victim of actions specified in Section 288 of this code and a petition has been filed pursuant to Section 300 of the Welfare and Institutions Code with regard to the minor, evaluate what action or actions would be in the best interest of the child victim.  Notwithstanding any other provision of law, the county welfare department or probation department shall submit in writing its findings and the reasons therefor to the district attorney on or before the completion of the investigation.  The written findings and the reasons therefor shall be delivered or made accessible to the defendant or his or her counsel in the manner specified in Section 859.

(b) The local law enforcement agency having jurisdiction over a case reported under Section 11166 shall report to the district office of the State Department of Social Services any case reported under this section if the case involves a facility specified in paragraph (5) or (6) of subdivision (a) of Section 1502,Section 1596.750 or 1596.76 of the Health and Safety Code, and the licensing of the facility has not been delegated to a county agency.  The law enforcement agency shall send a copy of its investigation report and any other pertinent materials to the licensing agency upon the request of the licensing agency.