Wash. R. ELC. ELC 5.2
If a person files a grievance or provides information to disciplinary counsel about a lawyer's possible misconduct or disability, and asks to be treated as a confidential source, an investigation may be conducted in the name of the Office of Disciplinary Counsel. The confidential source has neither the rights nor the duties of a grievant. Unless otherwise ordered, the person's identity may not be disclosed, either during the investigation or in subsequent formal proceedings. If the respondent lawyer requests disclosure of the person's identity, the Chair, the chair of a review committee, or a hearing officer before whom a matter is pending examines disciplinary counsel and any requested documents or file materials in camera without the presence of the respondent or respondent's counsel and may order disciplinary counsel to reveal the identity to the respondent if doing so appears necessary for the respondent to conduct a proper defense in the proceeding.
Wash. R. ELC. ELC 5.2