J-P: I think they still do make the Capsicum devices (Pepper Spray) but not sure, in my state, if they are generally legal. They are often used as dog-repelling devices, because as you know, the tear-gas agents don’t work on dogs due to their differences in physiology (as I recall, dogs don’t have tear ducts). Squirting a dog in the face with plain water is about as effective as squirting him with CN or CS in a liquid carrier. Pepper spray works much better on them.
A strong capsicum spray is also fairly effective on people, I believe, although it generally takes a little longer in incapacitate them than does CN. Of course, that is partially affected by the will to resist of the person sprayed. Some people, especially if they are familiar with tear-gas agents and have a strong will to resist, can overcome even CN gas, as one of the main control-functions, the causing of panic, is gone for those people. At a civilian level, the use of chemical-agent devices against an attacker, especially an armed one, is always a crap shoot. If the user of the device isn’t aware of the wind, for example, he can “gas” himself rather than his opponent. I have never fired one of the tear-gar pistols - they are illegal in our state and have been forever - it is not one of the more or less current anti-gun (hell - anti-everything) laws passed by the liberals here. I suspect that the wind affects them as well.