My knife use education began around 4 y.o., and when I started 1st grade (1961), my grandfather gave me my first knife with the statement - "We can't have you borrowing anyone else's knife at school." Every day until 5th grade, I carried a knife. 5th grade on, I carried 2, one in each front pocket.
Until 9/11, I carried at least 2 pocket knives every day, with few exceptions
- when wearing Dress Whites in the Navy (no access under the tunic),
- when going on liberty in foreign ports (local law compliance),
- when in the hospital wearing one of those split-up-the-back hospital gowns (no pockets).
I had other knives on my EMS duty belt.
After 9/11. I started carry dual fixed blades EDC, just because I could and I no longer worked in a corporate environment the banned knives. (Although I carried them anyway as part of my EMS gear.

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That's all back ground as to why schools have their policies (and some states actual laws, re: knives on school properties) - lack of early education in the proper care, feeding and use of knives. The lack of training leads to improper use and hence the bans.
Since the local schools banned the carry of ANY knife on school properties, I have voted with my pocketbook and refused to attend or support ANY school sporting event or function.
I was recently asked if I could come to one of the local schools to talk about bees and beekeeping (I'm currently the only known beekeeper in the school district).
My response was "Sure, if you can get the School Superintendent to provide me with advance permission, IN WRITING, to bring knives onto school property."
When asked why, I simply said "My knives are tools that I use on a daily basis for beekeeping, as well as many other tasks."
Still waiting, but not holding my breath.