The majority of barrel bombs used in Syria are the smaller mortar type bombs. Thousands have been used.
Every single time it was proven CW's were actually used it was these smaller devices, or grenades. Proving who actually used them has been impossible.
Last year there was a hole in the ground to prove who did what, no proof of airborne delivery... despite reports.
Show me a shred of proof they've been dropping CW's out of Airplanes or helicopters?
You spouted on about 100 CW/barrel bomb attacks per year since 2014, like barrel bombs are something heinous and special. And made an issue to state only the government has aircraft.