You could use Narcoject. But Narcoject actually annoys me a lot, because it deals 10 stun, and is resisted by Body. So either you do someone 10 stun, he gets at least one success (which is probable even for someone with body 3) and he merrily continues on his way, or you give him two, and put him to hospital for few weeks, because he now has, depending on how lucky he is, 8, 9 or 10 physical.
So that thing either don't work, or almost kills someone. If it did 12 stun, or 6, that would work okay. But nooooo, the person who did that rule wasn't thinking.
EDIT: ahem, sorry for ranting. It just annoys me. Yeah, I can houserule that away, I shouldn't have to.