oh c'mon pettygrudger everyone knows this. What makes chemical warheads so special is that they have the durability and special construction to deliver a chemical compound without the chemical compound being so disturbed in it's trajectory that it loses it's potency. The shelf life of certain chemicals is longer than others, I don't know the specifics, but you don't just put VX in a mason jar and stick it in the fridge. These chemicals are fragile and are often stored elsewhere.
I'm not talking about the chemicals crack smoker (takes one to know one right?!). I'm talking about the "WARHEADS" that would be used to deliver said chemicals, which is what they've found.