4 oz of botulism or some hemorrhagic flu is most CERTAINLY a weapon of mass destruction.

I can only imagine someone with evil enough intent to put a canister like that in one of those Glade "bathroom smelly" devices. In a public restroom, you'd be spreading death.

4 oz is ridiculous overkill for direct infection of certain diseases at the same time it's not enough explosives to harm much more than one room. It's a pretty useless threshold to have.