Section 46.37.672 - Signal preemption device-Use, sale, purchase-Penalty(1) It is unlawful to: (a) Use a signal preemption device except as authorized in RCW 46.37.670;(b) Sell a signal preemption device to a person other than a person described in RCW 46.37.670; or(c) Purchase a signal preemption device for use other than a duty as described in RCW 46.37.670.(2) A person who violates this section is guilty of a gross misdemeanor.