How Come we still have flies?

I was finishing up some paperwork when Bill came into the office. His grubby coveralls were covered with a fine white powder.
"What's that white stuff?" I asked with some trepidation. Anthrax scares were back in the news and - of course - weighing heavily on my mind.
He wet a finger and swabbed some of it off his sleeved. He tasted the sample "Plaster dust, I think."
"Where the hell were you working?"
"The Ceruminous area, like you said to." He shrugged. We recycle tons of recovered ear wax from the HMO and sell it to a company that ships it to China. In that bastion of capitalism, low paid artisans fashion the substance into figurines of animals which are painted and then shipped back to the USA to be sold in discount stores as lawn ornaments.
"So how did you get dusted?"
"There was a small aircraft flying pretty low, and there was smoke or something coming out of the tail. I figured it was gonna crash, but I never heard an explosion." He tasted the powder again - oh yeah, now I know: It's Insecticide."
We both breathed a sigh of relief.