[Strategerist]

Wasn’t there a theory that said Iraq’s chemical weapons were moved to Syria prior to US invasion? Is there any way we can find out the origin of the gas used like they can with nuclear material?

It's exceedingly unlikely one could do so, and it's overwhelmingly likely that any chemical weapons in Syria were produced in Syria in their own well-documented massive chemical weapons production facilities they've had since the 1970s.

[AppyPappy]

But it will still be hard to figure out who did it. Neither side is a pillar of virtue.
Glad I’m not making the decisions.