1. Illegal at law level 2?
2. There should be some serious modifiers for armour - combat / BD should ignore it, some other armours may have woven in insulators.
Two other interesting variants:
Decapacitator: A laser-based system which has only about a 10m range. Works best on the unsuspecting. Stopped by most modern visors or fancy high tech eyegear that can dynamically polarize. Also stopped by closing your eyes. But if it does catch you with your eyes open, the results are nausea, vomiting sometimes, weakness, and dizziness - a general inability to effectively resist. Primary usage: Spec Ops take-down teams, Bounty Hunters, or Law Enforcement trying to subdue and cuff people. Also useful probably for nefarious purposes. Size: MAG-light.
Stun Mesh: Mesh armour, but with an insulating layer on the inside, a conducting mesh, and a battery pack. When set in active mode, someone grabbing the user gets a nasty electrical shock (similar to the cane). Attacking the user with knives, etc. isn't too bright either. A big stick won't invoke the shock though. Nor will a Gauss Pistol.