Until 2 years ago, I lived in Jersey.
There's a decent amount of members here that live there, but I don't know about any "culture" to speak of.
(These guys sure ain't got none!)

Howard Viehle lives there, Westwood, I think.
The laws when I lived there were blurry as hell.
I was friends with LOTS of cops and not one of 'em knew what was legal or not. Some would do the airport security rule, placing the blade across their hands and if it was longer than your 4 fingers, it was bad.
I told them that was nonsense, as the law is SPECIFIC and not allow something that a standard could be set by a dwarf or a giant.
I was searched a few times and had knives found that were "concealed", but as I wasn't involved in any violent activities, nothing was mentioned about the blades and they were returned immediately.
Switchblades are a no-no tho. Unless you have a "reason" to have one, that is. I was a firefighter/EMT so I DID have a reason, and never got any grief about 'em.
Bottom line is as long as you're not acting like an idiot, most cops'll leave ya be as far as carrying knives go.
It's just that there's no definitive laws about knives that they can go by.
But if you act like an idiot, you'll be nailed with carrying a concealed weapon if you have a multi-tool on your belt, covered by a jacket.
Knife-wise, Jersey ain't so bad.
FIREARM-wise, on the other hand.... well, let's just say I didn't move to Nevada cuz I like oven-like heat!
Hope that helps,
VG