Wasn't sure if this belongs in religious news or political debates, but I suppose the mods can move it if necessary;
'Sikh Queenslanders allowed to carry ceremonial knives in schools after court ruling
The Kirpan resembles a small, blunt sword that is usually worn beneath clothing...
...Carrying knives in public places and schools in Queensland was subject to a blanket ban — until this week.'
Source:
A Queensland court just allowed some people to carry knives in schools. Here's why
So basically from what I gather as a student you are only allowed to carry a knife in queensland schools for religious reasons after the courts overturned an earlier decision.
The article notes that the Sikh kirpan is blunt, but if it mentioned that there is a requirement for religious weapons to be blunt I must have missed it.