it is a crime under section 90 of the Criminal Code of Canada to carry any weapon, including a baton, in a concealed fashion. You can own it. I you carry it must be visible. If you use it in self defence and you carried it concealed you will be charged.
extreme example. You can have a katana at the waist ban but you cannot conceal your baton
extreme example. You can have a katana at the waist ban but you cannot conceal your baton