I don't pay any attention to WA state knife laws. Not because I'm ignorant, its just theres no cops and I don't hang with the wrong crowd. Besides with Buck right here across the border you will see cops in there also.
WA STATE LAW
It is a gross misdemeanor to furtively carry with the intent to conceal any ‘dagger’ ‘dirk’ or ‘other dangerous weapon’. There is a circumstances of possession element to ‘other dangerous weapon’ such that it can include, for instance, a paring knife with a 3-inch blade.
It is also a gross misdemeanor to simply possess a spring blade knife which under the definition would include an automatic knife or gravity knife; but exclude any movable blade knife with a ‘bias toward closure’