Could I bring Sai(weapon) to school?

Some schools and Principal's have a zero tolerance for weapons of any kind and the fact that the ends and points are blunted or rounded and not sharp may still get you in trouble or suspended. Such is the hysteria in some places and even though a broken broom stick out of the janitors closet would be more of a weapon sais are still clified as such. I would talk to the principle and show him a picture of them and explain they are a traditional martial arts weapon which really means that was actually a farm implement and used as a weapon by the peasants and farmers since they were not allowed to have bladed weapons during feudal times. You might also add that many tournaments are held at such schools on weekends and unsharpend weapons are there and weapons competitions are held at most such tournaments were martial artist like yourself demonstrate their skill with them and there is never any issue with that ever raised. He or she can make the ultimate decision and probably help you to avoid trouble.