Cal. Health & Safety Code § 8372

A hydrolysis facility shall not make or enforce any rules requiring that human remains be placed in a casket before hydrolysis or that human remains be hydrolyzed in a casket, nor shall a hydrolysis facility refuse to accept human remains for hydrolysis for the reason that they are not in a casket. Every director, officer, agent, or representative of a hydrolysis facility who violates this section is guilty of a misdemeanor. Nothing in this section shall be construed to prohibit the requiring of some type of container or disposal unit, as specified in Section 7006.6.