A regular cane can do a lot of damage already, this is illegal in Kalifornia for sure. I am pretty sure it's illegal in a lot of other states. Or else, it's too easy.Of course if you and 20 of your MA studnts are on that bus, the outcome will be different.
Also if you have a walking cane like this (since firearm is not available), the outcome will also be different.
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I carry a 20oz fiber filled Nylon cane, I don't think anyone would appreciate hitting by that.