RCW 68.50.185: Individual final disposition—Exception—Penalty.

(1) A person authorized to dispose of human remains may not perform or cause to be performed final disposition of more than one human remains at a time unless written permission, after full and adequate disclosure regarding the manner of disposition, has been received from the person or persons under RCW 68.50.160 having the authority to order final disposition. This restriction does not apply when equipment, techniques, or devices are employed that keep human remains separate and distinct before, during, and after the final disposition process.

(2) Violation of this section is a gross misdemeanor.