It’s interesting… we carry OC on our duty belts, but since I spend a good majority of the time in a hospital setting, they don’t really like us using it due to the contamination factor. And we’re not authorized to carry Taser’s either, so really our bread n’ butter is defensive tactics. That’s one of the reason’s I’m such a huge advocate of SDTS and GDT; it just plain works when I need it.
As far as OC goes, in my experience it works “most” of the time, but I have seen a few people just shake it off. That’s one of the reasons I’m not a big fan; that, and the fact that it’s affected by environmental factors such as wind and rain. I’m just normally not too keen on placing my trust in something that may or may not work when I need it most. I’d rather hit ’em with a good old fashioned chin jab or hand yoke and be done with it.