Sadly, they weren’t there before the invasion.  Now wonder most Americans (correctly) believe that the Iraq War has made us less safe.  From WaPo:

U.S. troops raiding a warehouse in the northern city of Mosul uncovered a suspected chemical weapons factory containing 1,500 gallons of chemicals believed destined for attacks on U.S. and Iraqi forces and civilians, military officials said Saturday.

Monday’s early morning raid found 11 precursor agents, "some of them quite dangerous by themselves," a military spokesman, Lt. Col. Steven A. Boylan, said in Baghdad.

Combined, the chemicals would yield an agent capable of "lingering hazards" for those exposed to it, Boylan said. The likely targets would have been "coalition and Iraqi security forces, and Iraqi civilians," partly because the chemicals would be difficult to keep from spreading over a wide area, he said.

Boylan said the suspected lab was new, dating from some time after the U.S.-led invasion of Iraq in 2003. The Bush administration cited evidence that Saddam Hussein’s government was manufacturing weapons of mass destruction as the main justification for the invasion. No such weapons or factories were found.

But the fact that the chemical weapons were dated post-invasion doesn’t stop the morons at Powerline from asking:

One can’t help wondering, too, how long the facility has been there and whether it could have played a role in Saddam’s chemical weapons program.

Blinders.