Washington Revised Code Title 77. Fish and Wildlife § 77.15.150. Poison or explosives--Unlawful use--Penalty

(a) The person lays out, sets out, or uses a drug, poison, or other deleterious substance that kills, injures, harms, or endangers fish, shellfish, or wildlife, except if the person is using the substance in compliance with federal and state laws and label instructions; or

(b) The person lays out, sets out, or uses an explosive that kills, injures, harms, or endangers fish, shellfish, or wildlife, except if authorized by law or permit of the director.