Wash. Rev. Code § 9.94A.825
In a criminal case wherein there has been a special allegation and evidence establishing that the accused or an accomplice was armed with a deadly weapon at the time of the commission of the crime, the court shall make a finding of fact of whether or not the accused or an accomplice was armed with a deadly weapon at the time of the commission of the crime, or if a jury trial is had, the jury shall, if it find[s] the defendant guilty, also find a special verdict as to whether or not the defendant or an accomplice was armed with a deadly weapon at the time of the commission of the crime.
For purposes of this section, a deadly weapon is an implement or instrument which has the capacity to inflict death and from the manner in which it is used, is likely to produce or may easily and readily produce death. The following instruments are included in the term deadly weapon: Blackjack, sling shot, billy, sand club, sandbag, metal knuckles, any dirk, dagger, pistol, revolver, or any other firearm, any knife having a blade longer than three inches, any razor with an unguarded blade, any metal pipe or bar used or intended to be used as a club, any explosive, and any weapon containing poisonous or injurious gas.
RCW 9.94A.825
Effective date-1983 c 163: See note following RCW 9.94A.505.