California Code, Welfare and Institutions Code - WIC § 272

(b) The board of supervisors may also delegate to those persons within the county welfare department and to any Indian tribe that has entered into an agreement pursuant to Section 10553.1 performing child welfare services the probation officer's right of access to state summary criminal history information pursuant to Section 11105 of the Penal Code as is necessary to carry out its duties concerning children reasonably believed to be described by Section 300. The information shall include any current incarceration, the location of any current probation or parole, any current requirement that the individual register pursuant to Section 290 or 457.1 of the Penal Code, or pursuant to Section 11140 or 11590 of the Health and Safety Code, and any history of offenses involving abuse or neglect of, or violence against, a child, or convictions of any offenses involving violence, sexual offenses, the abuse or illegal possession, manufacture, or sale of alcohol or controlled substances, and any arrest for which the person is released on bail or on his or her own recognizance.

(c) Notwithstanding subdivision (a), a social worker in a county welfare department or an Indian tribe that has entered into an agreement pursuant to Section 10553.1 may perform the duties specified by Section 306.