Think tanks receive funding from businesses, wealthy donors, and some receive government contracts. They aren't any different from the media, and if their data can't be confirmed by anyone else, they aren't a reliable source.

The Mackenzie link you gave me refers to chemical weapons, and I looked up "Muthana WMD", but only found information about chemical weapons. These labs were developed in the 80s or 90s and the US knew about them. They aren't WMD.

I'm not being stubborn and egotistical, but the information you provided refers to chemical weapons we already knew about.