I was subjected to a liberal rant about Assad gassing Syrian people, and it sounded like some BS (Just smells like propaganda), but the Internet is a fuck these days and I'm unable to find any informtion I trust, or develop the tools to debunk wikihasbara.
Did it happen?
I'm sure that someone else might have a better answer but likely bullshit. This was sort of the bombshell article on it. Theodore Postol is a leading expert on these sort of weapons systems, and he makes arguments that haven't been meaningfully disputed from what I've read.