Re: knock out gas?
Not sure there is anything like weaponized knockout gas. Dosage would be uncontrollable so probably either useless or fatal.
The usual rule of thumb in these matters is, if you can think of something, then somebody has already made a weapon out of it. Weaponized anesthetics certainly do exist; here is one well-publicised example.
They are indeed highly dangerous, with a large fraction of affected people dying unless an immediate medical assistance is provided. Nonetheless, they are much less fatal than being blown to pieces.
Biting the hand that feeds IT
