Anti-Ghost gun

[Crumplehat]

Because that would involve critter code or whatever and that's a can of worms nobody wants to mess with. It's likely easier to just not make it work on them. That said, I can see why you'd want it to work that way; it'd certainly help when a vampire keeps summoning the damn things all the time.

Also, Tasers work on displaced particle fields, but as far as I know not so much on spirits? I could be wrong though.