All you've gotta do is unscrew that little hinge, and BOOM: You've got two small knives.
I know that knives are easier to harm with, but scissors can pretty much be used for the exact same thing. I'm not suggesting a ban on scissors or anything, but... why?
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you have to draw a line somewhere. plus, there are plenty of knives in schools, exact-o knives and similar things. The issue isn't with students using them, its about a lone student carrying one on their person.