(a) Except as provided in subdivision (b), evidence of any of the following statements made by a declarant who is unavailable as a witness is not made inadmissible by the hearsay rule:
(1) That the declarant has or has not made a will or established or amended a revocable trust.
(2) That the declarant has or has not revoked his or her will, revocable trust, or an amendment to a revocable trust.
(3) That identifies the declarant’s will, revocable trust, or an amendment to a revocable trust.
(b) Evidence of a statement is inadmissible under this section if the statement was made under circumstances that indicate its lack of trustworthiness.