All of the cases I've heard of involved pre-existing weaknesses (congenital heart weakness, etc). Either way, I think we all know pretty much anything can
potentially be lethal. Even
water can be toxic if taken to the right extreme.
Getting back towards the thread topic, Spy Games has a throwable micro-net that entangles enemies, so this could be seen as support for a conductive-filament-based electrical stun grenade. Or just get yourself a Taser Shockwave and have the capability to put down a crowd repeatedly. It's good PR because you're not spraying blood around, and it's safer than a rubber pellet claymore because you can re-activate it for those trolls and other toughies who didn't stay down.