It is rare, but here is a story that shows when it comes to autos the law does get enforced sometimes.
http://www.wyff4.com/news/22008485/detail.html
http://www.wyff4.com/news/22008485/detail.html
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https://www.bladeforums.com/threads/bladeforums-2024-traditional-knife.2003187/
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This is a confusing law to me. By the knife laws in my state, for example, switchblade knives are illegal,and they are defined as any knife that automatically opens by a button or switch in the handle, etc... I happen to know someone who has an Italian made stilletto switchblade, and it's put away where it never sees the light of day. Was handed down to him and most likely made in the 1950's or 40's.
On the other hand, right down the street from me, there is a shop that carries half a dozen autos like the small benchmade ruckus and similar models by different mfg. All pushbutton operated. So what makes these knives legal, and if they are not, then how is it that the store sells them and people buy them. I see auto knives for sale in lots of stores in my state.