From my understanding of the rule book and with talking with the wardens you are allowed to carry one with you for protection.
Most bears usually run when they see or hear a person. The bears around were I hunt are getting so big, and so used to people, and so many of them around, that they are pretty much fearless.
I shot a doe on sat night and took out both front shoulders. She dropped right in her tracks but it took a little bit for her to die. between the noise and the smell, it must have attracted the bears back. He stood about 10 yards from my deer growling and snapping. Mind you it was dark by now and I could barely see anything. I tried yelling at him, braking branches, threw some sticks, everything. Finally got him to run off far enough so i could get out of my tree. We came back about an hour later (with a shotgun and pistol this time) to get my deer. The boar was standing about 20 yards from her in the wide open. 4 guys making noise and hollaring at this bear and it never even flinched. Finally got close enough to grab the deer and we left. Of course i was the one without a gun and it wont happen again. The bear down there are getting to big and fearless to not have a little extra protection.