(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.