Cal. Health & Safety Code § 8020

Notwithstanding any other provision of law, and upon the request of any party or an intervenor, the commission or designated mediator may close part of a mediation session to the public if the commission or designated mediator finds that information required at the mediation session may include identification of the specific location of a burial site, human remains and cultural items or that information necessary for a determination regarding repatriation may compromise or interfere with any religious practice or custom.