The way the knife law is worded in Wisconsin, they are probably already illeagal, if the officer / DA wants to be a prick about it. Just kind of overlooked at this point.
here it is:
Wisconsin - 941.24. Possession of switchblade knife. (1)
Whoever manufactures, sells or offers to sell, transports,
purchases, possesses or goes armed with any knife having a
blade which opens by pressing a button, spring or other
device in the handle or by gravity or by a thrust or
movement is guilty of a Class A misdemeanor...
that prety much encompasses any knife that can be opened one handed if they want it to.
But they sell assited opening knives everywahere. I personally don't even really worry about the laws. I have never been searched, and pretty much just figure that the knife i carry should be one that I can afford to get taken away. So I don't usually carry autos or bali's, but its more do to the price than to worriying about getting in trouble.