RCW 69.41.060

If, upon the sworn complaint of any person, it shall be made to appear to any judge of the superior or district court that there is probable cause to believe that any legend drug is being used, manufactured, sold, bartered, exchanged, given away, furnished or otherwise disposed of or kept in violation of the provisions of this chapter, such judge shall, with or without the approval of the prosecuting attorney, issue a warrant directed to any peace officer in the county, commanding the peace officer to search the premises designated and described in such complaint and warrant, and to seize all legend drugs there found, together with the vessels in which they are contained, and all implements, furniture and fixtures used or kept for the illegal manufacture, sale, barter, exchange, giving away, furnishing or otherwise disposing of such legend drugs and to safely keep the same, and to make a return of said warrant within three days, showing all acts and things done thereunder, with a particular statement of all articles seized and the name of the person or persons in whose possession the same were found, if any, and if no person be found in the possession of said articles, the returns shall so state. A copy of said warrant shall be served upon the person or persons found in possession of any such legend drugs, furniture or fixtures so seized, and if no person be found in the possession thereof, a copy of said warrant shall be posted on the door of the building or room wherein the same are found, or, if there be no door, then in any conspicuous place upon the premises.