There was very little material support given to Iraq during their war with Iran. Mostly what we gave them was analysis of where to hit Iran so as to disrupt their economy and war-fighting ability.
We weren’t really supporting Iraq, we were encouraging and enabling both iraq and Iran to expend themselves.
We not only lifted many export licenses for Iraq, we removed them from State Department’s list of terrorist countries in 82. We also supplied them with satellite imagery, Iranian defense locations and other intelligence assets for the use of chemical weapons against Iran.
As for pathogens and such, look up the Riegle report. We exported over 50 shipments of anthrax alone to Iraq.