That means you can't be in possession of a knife that can cut steak, a knife kept in your fishing tackle box and used for fileting fish, an axe or hatchet for cutting wood ...
... heck, if you're Bruce Campbell, that means a chainsaw as well ...
I'd really like to see them be non-hypocritical and censure all students who have used a steak knife during the school year.
In fact, if the school has a field and track team, they'd better not be throwing a javelin ...
How do they play baseball without bats?