California Code, Welfare and Institutions Code - WIC § 5751.7

(a) For the purposes of this part and the Lanterman-Petris-Short Act (Part 1 (commencing with Section 5000)), the State Department of Health Care Services and the State Department of State Hospitals shall ensure that, whenever feasible, minors shall not be admitted into psychiatric treatment with adults if the health facility has no specific separate housing arrangements, treatment staff, and treatment programs designed to serve children or adolescents. The Director of Health Care Services shall provide waivers to counties, upon their request, if this policy creates undue hardship in any county due to inadequate or unavailable alternative resources. In granting the waivers, the Director of Health Care Services shall require the county to establish specific treatment protocols and administrative procedures for identifying and providing appropriate treatment to minors admitted with adults.

(b) However, notwithstanding any other provision of law, no minor may be admitted for psychiatric treatment into the same treatment ward as any adult receiving treatment who is in the custody of any jailor for a violent crime, is a known registered sex offender, or has a known history of, or exhibits inappropriate, sexual, or other violent behavior which would present a threat to the physical safety of minors.