California Code, Health and Safety Code - HSC § 7150.30

(a) An individual may refuse to make an anatomical gift of the individual's body or part by any of the following:

(b) A record signed pursuant to subparagraph (B) of paragraph (1) of subdivision (a) shall comply with both of the following:

(c) An individual who has made a refusal may amend or revoke the refusal by any of the following:

(d) Except as otherwise provided in subdivision (h) of Section 7150.35, in the absence of an express, contrary indication by the individual set forth in the refusal, an individual's unrevoked refusal to make an anatomical gift of the individual's body or part bars all other persons from making an anatomical gift of the individual's body or part.

(e) Notwithstanding any provision to the contrary, including, but not limited to, Section 7150.40, only an individual shall make an anatomical gift of all or part of that individual's body or pacemaker, if it is made known that the individual, at the time of death, was a member of a religion, church, sect, or denomination that relies solely upon prayer for healing of disease or that has religious tenets that would be violated by the disposition of the human body or parts or pacemakers for the purposes of transplantation, therapy, research, or education.