California Code, Family Code - FAM § 8807

(a) Except as provided in subdivisions (b) and (c), within 180 days after receiving 50 percent of the fee, the department or delegated county adoption agency shall investigate the proposed independent adoption and, after the remaining balance of the fee is paid, submit to the court a full report of the facts disclosed by its inquiry with a recommendation regarding the granting of the petition.If the petitioners have a valid preplacement evaluation or a valid private agency adoption home study, as described in paragraph (2) of subdivision (a) of Section 8810, and no new information has been discovered and no new event has occurred subsequent to the approval of the evaluation or home study that creates a reasonable belief that further investigation is necessary, the department or delegated county adoption agency may elect not to reinvestigate any matters covered in the evaluation or home study, except that the department shall complete all background clearances required by law.

(b) If the investigation establishes that there is a serious question concerning the suitability of the petitioners, the care provided to the child, or the availability of the consent to adoption, the report shall be filed immediately.

(c) In its discretion, the court may allow additional time for the filing of the report, after at least five days' notice to the petitioner or petitioners and an opportunity for the petitioner or petitioners to be heard with respect to the request for additional time.

(d) If a petitioner is a resident of a state other than California, an updated and current home study report, conducted and approved by a licensed adoption agency or other authorized resource in the state in which the petitioner resides, shall be reviewed and endorsed by the department or delegated county adoption agency, if the standards and criteria established for a home study report in the other state are substantially commensurate with the home study standards and criteria established in California adoption regulations.