Reuters repots the best evidence that Assad had a direct hand in the use of chemical weapons against civilians in Syria:
An analysis by the Congressional Research Service, a branch of the Library of Congress, reported that a declassified U.S. government paper summarizing intelligence findings concludes that Syrian government officials were “witting and directed” the gas attack. But the evidence of who ordered it was not watertight, the analysis said.
The findings were partly based on intercepted communications “involving a senior official intimately familiar with the offensive” which “confirmed that chemical weapons were used by the regime,” it said.
As more information has been collected and analyzed, early theories about the attack have largely been dismissed, U.S. and allied security sources said.
Reports that Assad’s brother, Maher, a general who commands an elite Republican Guard unit and a crack Syrian army armored division, gave the order to use chemicals have not been substantiated, U.S. sources said. Some U.S. sources now believe Maher Assad did not order the attack and was not directly involved.
It genuinely concerns me that the reason that the United States hasn’t made a more convincing case is that we don’t have one.