Wash. Rev. Code § 9.26A.120
Any person who shall knowingly and wilfully operate, or cause to be operated, or who shall attempt to operate, or attempt to cause to be operated, [any] coin-box telephone or other receptacle designed to receive lawful coin of the United States of America in connection with the sale, use or enjoyment of property or service, by means of a slug or any false, counterfeited, mutilated, sweated or foreign coin, or by any means, method, trick or device whatsoever not lawfully authorized by the owner, lessee, or licensee of such machine, coin-box telephone or other receptacle designed to receive lawful coin of the United States of America in connection with the sale, use or enjoyment of property or service, any goods, wares, merchandise, gas, electric current, article of value, or the use or enjoyment of any telephone or telegraph facilities or service without depositing in and surrendering to such machine, coin-box telephone or receptacle lawful coin of the United States of America to the amount required therefor by the owner, lessee or licensee of such machine, coin-box telephone or receptacle, shall be guilty of a misdemeanor.
RCW 9.26A.120