According to British intelligence, the Syrian government forces were not the perpetrators of the 2013 Ghouta attack. // Turkish forces found sarin in flats of Al-Nusra Front members. // No inspectors visited the scene of the Idlib chemical attack.
According to British Joint Intelligence Organisation, "it is highly likely that the regime was responsible for the CW attacks." http://bit.ly/1NJczHo // The chemical found was not sarin but antifreeze: http://bit.ly/2ptTVOq // Investigators from the OPCW visited the scene and the OPCW is currently investigating the whole incident: http://bit.ly/2ow9MgZ