UN investigator Carla Del Ponte said that there is strong evidence that the rebels used chemical weapons, but that there is not evidence that the government used such weapons.
This is not surprising. Haaretz reported on March 24th, “Jihadists, not Assad, apparently behind reported chemical attack in Syria“.
The “rebels” in Syria that the U.S. has been arming and otherwise supporting are Al Qaeda and Muslim Brotherhood.
Unfortunately, history is repeating.
Specifically, the American government gave chemical weapons to Saddam Hussein … which he then used on Iran and on his own Kurdish population.
The American government attempted to blame Iran for the chemical weapons attack on Iraq’s Kurds.
And see this.