Cal. Welf. & Inst. Code § 11495.25

Sworn statements by a victim of past or present abuse shall be sufficient to establish abuse unless the agency documents in writing an independent, reasonable basis to find the recipient not credible. Evidence may also include, but is not limited to: police, government agency, or court records or files; documentation from a domestic violence program, legal, clerical, medical or other professional from whom the applicant or recipient has sought assistance in dealing with abuse; or other evidence, such as a statement from any other individual with knowledge of the circumstances that provide the basis for the claim, physical evidence of abuse, or any other evidence that supports the statement.