Cal. PEN § 11165.13

For purposes of this article, a positive toxicology screen at the time of the delivery of an infant is not in and of itself a sufficient basis for reporting child abuse or neglect. However, any indication of maternal substance abuse shall lead to an assessment of the needs of the mother and child pursuant to Section 123605 of the Health and Safety Code. If other factors are present that indicate risk to a child, then a report shall be made. However, a report based on risk to a child which relates solely to the inability of the parent to provide the child with regular care due to the parent’s substance abuse shall be made only to a county welfare or probation department, and not to a law enforcement agency.