Wash. Rev. Code § 11.120.130
Unless otherwise ordered by the court, directed by the user, or provided in a trust, a custodian shall disclose, to a trustee that is not an original user of an account, a catalogue of electronic communications sent or received by an original or successor user and stored, carried, or maintained by the custodian in an account of the trust and any digital assets, other than the content of electronic communications in which the trust has a right or interest, if the trustee gives the custodian:
(4) If requested by the custodian:
[ 2016 c 140 s 13.]