California Code, Penal Code - PEN § 11160

(a) A health practitioner, as defined in subdivision (a) of Section 11162.5, employed by a health facility, clinic, physician's office, local or state public health department, local government agency, or a clinic or other type of facility operated by a local or state public health department who, in the health practitioner's professional capacity or within the scope of the health practitioner's employment, provides medical services for a physical condition to a patient whom the health practitioner knows or reasonably suspects is a person described as follows, shall immediately make a report in accordance with subdivision (b):

(b) A health practitioner, as defined in subdivision (a) of Section 11162.5, employed by a health facility, clinic, physician's office, local or state public health department, local government agency, or a clinic or other type of facility operated by a local or state public health department shall make a report regarding persons described in subdivision (a) to a local law enforcement agency as follows:

(c) For the purposes of this section, “injury” does not include any psychological or physical condition brought about solely through the voluntary administration of a narcotic or restricted dangerous drug.

(d) For the purposes of this section, “assaultive or abusive conduct” includes any of the following offenses:

(e) When two or more persons who are required to report are present and jointly have knowledge of a known or suspected instance of violence that is required to be reported pursuant to this section, and when there is an agreement among these persons to report as a team, the team may select by mutual agreement a member of the team to make a report by telephone and a single written report, as required by subdivision (b). The written report shall be signed by the selected member of the reporting team. Any member who has knowledge that the member designated to report has failed to do so shall thereafter make the report.

(f) The reporting duties under this section are individual, except as provided in subdivision (e).

(g) A supervisor or administrator shall not impede or inhibit the reporting duties required under this section and a person making a report pursuant to this section shall not be subject to any sanction for making the report. However, internal procedures to facilitate reporting and apprise supervisors and administrators of reports may be established, except that these procedures shall not be inconsistent with this article. The internal procedures shall not require an employee required to make a report under this article to disclose the employee's identity to the employer.

(h) For the purposes of this section, it is the Legislature's intent to avoid duplication of information.

(i) For purposes of this section only, “employed by a local government agency” includes an employee of an entity under contract with a local government agency to provide medical services.