The second link Ghostrider provided applies to knives and guns. The first link applies to bludgeons and gas/aerosol weapons.
(1) A person shall not manufacture, sell, offer for sale, or possess any of the following:
d) A blackjack, slungshot, billy, metallic knuckles, sand club, sand bag, or bludgeon.
(e) A device, weapon, cartridge, container, or contrivance designed to render a person temporarily or permanently disabled by the ejection, release, or emission of a gas or other substance.
So, it seems, you
could be outside of the law if you used bear or wasp spray to defend yourself from a person. My argument would be that the bear/wasp spray can isn't designed for use against a person. But as somebody else posted it may be a federalviolation to use said substance in a manner that it wasn't designed for.
It doesn't specifically mention the illegality of concealing any of the listed items. It spells out that possession, whether concealed or not, is a felony.
Oh, it also exempts certain self-defense sprays:
(3) Subsection (1) does not apply to any of the following:
(a) A self-defense spray or foam device as defined in section 224d.
So it would seem that a SD spray that falls within the limits specified in 224d would be your best, legal, option.
Bronson