I'll field that one. No evidence is provided.
What cite does the writer give for the information that substantial amounts of WMD have been discovered by ISIS?
I'll field that one too. A blog linked to that blog states that the information came from an unnamed "Iraqi government spokesman". No other evidence is provided.
Google search turned up this one.
http://www.frontpagemag.com/2014/arnold-ahlert/saddams-wmds-the-lefts-iraq-lies-exposed/