Wash. Rev. Code § 5.68.010
Protection from compelled disclosure—Exceptions—Definition
(1) Except as provided in subsection (2) of this section, no judicial, legislative, administrative, or other body with the power to issue a subpoena or other compulsory process may compel the news media to testify, produce, or otherwise disclose:(a) The identity of a source of any news or information or any information…