The same works for Pepper Spray, under the 2000 laws it would be covered under the aerosol noxious substances but they are still sold. I think the new amendments covered pellet guns, tazers, etc. as well. Wish I could find a copy.
Either way, if you have questions about gun laws it's best to contact the people that administer them.
Here is the page for the license application.
http://www.belize.gov.bz/ct.asp?xItem=1666&ctNode=486&mp=27