Cal. Penal Code § 236.2
Law enforcement agencies shall use due diligence to identify all victims of human trafficking, regardless of the citizenship of the person. When a peace officer comes into contact with a person who has been deprived of his or her personal liberty, a minor who has engaged in a commercial sex act, a person suspected of violating subdivision (a) or (b) of Section 647, or a victim of a crime of domestic violence or sexual assault, the peace officer shall consider whether the following indicators of human trafficking are present: