Wash. Rev. Code § 7.36.170
The court or judge shall have power to require and compel the attendance of witnesses, and to do all other acts necessary to determine the case.
[Code 1881 s 680; 1877 p 140 s 683; 1869 p 158 s 620; 1854 p 214 s 448; RRS s 1078.]
Witnesses, compelling attendance: Chapter 5.56 RCW.