Saddam used WMDs on the Kurds it is reported;
About a month ago, mustard gas was used by ISIS in Mosul it is reported and now we are where we are at in Syria however one sees it.
So, those using poisonous gases should be challenged I'd say.
This in Syria, whomever did it, I think the regime did; had some neuro-agents in it, it was a potent gas.