Wash. Rev. Code § 9.41.251
(1) RCW 9.41.250 does not apply to:
(a) The possession or use of a spring blade knife by a general authority law enforcement officer, firefighter or rescue member, Washington state patrol officer, or military member, while the officer or member:
(2) For the purposes of this section:
[ 2012 c 179 s 2.]