California Code, Probate Code - PROB § 1967

(a) The sterilization of a person in accordance with this chapter does not render the petitioner or any person participating in the conservatorship proceedings or sterilization liable, either civilly or criminally, except for any injury caused by negligent or willful misconduct in the performance of the sterilization.

(b) Notwithstanding the provisions of subdivision (a), any individual who petitions for authorization to consent to sterilization knowing that the person to whom the petition relates is capable of giving consent to sterilization as defined in Section 1951 is guilty of a misdemeanor, and may be civilly liable to the person concerning whom sterilization was sought.