Do you want to see some bizarre knife laws? Look at Maryland.
Bowie knives are illegal. Can you define a “Bowie” knife? Me neither, but apparently they know one when they see it.
A youth cannot carry a knife past dusk, unless they are part of an organized youth outdoor adventure group.
Switchblades cannot be carried with the intent to do harm. Huh? I’ve got a great Gerber automatic that I’m afraid to ever carry. Can they determine my intent?
IMHO, If you have a reason to carry a switchblade that *any* person would agree is due to functional needs -- you need a knife but only have one hand, your job requires you to frequently cut stuff with a knife (professional box-opener maybe?), you have arthritis in your fingers -- then if you end up using it for self-defense, nobody can say that self-defense was the *only* reason you had a switchblade on you to begin with.
Aside from outright bans, liberals love nothing more than muddying the waters enough to scare honest citizens into complying with de facto bans, even if the letter of the law permits said citizens to do whatever it is in question that the left opposes.