Maybe it wasn't 'fraudulent staging'. Maybe it was the real thing. Several hundred dead Mexicans say that the Obama administration isn't above expending a few innocents to 'stage' a basis for their bolshevik policies.
The so-called “rebels” have a stronger motive for gassing their own people and saying Assad did it, than Assad has for using the weapons at a time when his forces have made significant military gains and when the use of chemical weapons threatens to bring an international response.
However, as the article states, if Assad didn't use the weapons, why hinder the access of UN personnel to the attack site, which the Assad regime undoubtedly has?