While I'm not sure on the specific laws regarding WA, here in Canada automatic knives are legal to possess if you are active law enforcement, paramedic or similar and have the needed criteria to buy it through the national stocking system or other distributor. I can only assume that if your corporation is one that would encounter life and death situations where you need to open your knife with one hand, then you should be able to apply for special permits. As for more information on that, you'll have to wait for a reply from someone with more intimate knowledge of your area.