This does not apply to speed-safe knives, but - since 1959 - it has been illegal to posses any form of auto knife in the state of Wisconsin. this means that it's not a matter of carrying it off your own land/property/buisness property. You ( private citizen) simply may not have a auto knife in the state of Wisconsin - anywhere or anytime - period.You can't collect 'em - you can't legally own them. if found as part of a legal search - they will be seized - you may be charged.
I do not know if the federal exception for serving members of the armed forces or LE applies - if any one does know ( case law please) - please post it.
I do not know if the federal exception for serving members of the armed forces or LE applies - if any one does know ( case law please) - please post it.