Here is the long awaited final OPCW report on Douma.
https://www.opcw.org/media-centre/news/2019/03/opcw-issues-fact-finding-mission-report-chemical-weapons-use-allegation
Close reading of the text, particularly page 31, shows this:
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that the inspectors reckon there is a strong probability that chlorine was used (and only chlorine, not sarin as Western governments claimed).
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However, the inspectors will go no further than to state that it is 'possible', not even 'probable', that the chlorine was delivered by cylinders found in two locations. Unstated, but implicit, is the converse possibility that someone had placed and doctored these smoking guns in order to frame the Syrian government.
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For reasons unstated the inspectors say they did not follow up on the possibility of exhuming and examining any bodies.
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all the forensic evidence that chlorine was used came not from alleged victims but from the surroundings, especially wood. The report omits to mention the obvious: that the surroundings could have been deliberately doused with chlorine.