That's sarcasm directed at those trying desperately to come up with anything.
If they found a lot of chemicals at a farm, then it would be reasonable to assume pesticides first, chemical weapons second.
At a military base the opposite is true.
The substances have been tested in mobile labs, after the initial less sensitive tests were done:
More precise tests by an Army Fox mobile nuclear, biological and chemical detection laboratory indicated the existence of sarin and triggered the evacuation of the captured military compound by dozens of soldiers.
From Knight Ridder report.
We have our usual suspect here pushing the pesticide angle. Makes sense for a farm, not a military compound.
Hidden in bunkers, no less.