While they were able to conclude that Rebels used Chemical Weapons, they could not be definitive that Syria had used them in an earlier event.
Not one American Media Outlet(respected) ever mentioned that rebels not only had and used Chemical Weapons, but that the Obama Administration new an Iraqi Chemical Weapons Expert was working with the Syrian Opposition.
This makes the case that Assad wasn't the only one capable of carrying out Chemical Attacks in Syria...
Under both Obama and Trump, the propaganda machine is pumping out misinformation on purpose.
The chemicals are german. but truly, a veteran war reporter went to the site and swears there was NO attack