For StansBrew and anyone else passing through WA state, FYI on the King County regs...

The county does not have a 3" limit to the best of my understanding. The county is covered under state law which states, "It shall be unlawful for any person to carry, exhibit, display, or draw any [knife] apparently capable of producing bodily harm, in a manner, under circumstances, and at a time and place that either manifests an intent to intimidate another or that warrants alarm for the safety of other persons."

The only place with a different legal situation is the City of Seattle (and who wants to go to that side of the lake?) which prohibits (can not carry on your person) as follows:

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Seattle Municipal Code
The following definitions apply in this chapter:
A. "Dangerous knife" means any fixed-blade knife and any other knife having a blade more than three and one-half inches (3 1/2") in length.
B. "Fixed-blade knife" means any knife, regardless of blade length, with a blade which is permanently open and does not fold, retract or slide into the handle of the knife, and includes any dagger, sword, bayonet, bolo knife, hatchet, axe, straight-edged razor, or razor blade not in a package, dispenser or shaving appliance.
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Better watch that X-acto... it is a fixed blade and therefore illegal to possess within city limits!