There is a Turkish report circulating today that three victims were chemically poisoned by sarin gas. Link
The report falls short of chemical identification, instead hedging with evidence of symptoms which look like sarin poisoning. Yet sarin and sarin metabolites have distinct chemical fingerprints and isotopic signatures. The preferred method of detection is called GC/MS and it can detect very low quantities of the substance with absolute certainty. Of course, samples could be spiked with sarin, but even that would require sophistication.
I don't trust the Turks. Their President recently threatened friendly European governments with floods of refugees. Europeans fought the Ottoman Turks for centuries. We entered a war against Turkey's ally 100 years ago today. The Turks are no friend of democracy and are constantly harassing the Greeks.
Exactly who used or triggered chemical weapons last Tuesday is important. I am not impressed that our President has already made up his mind on both the types of weapons used and who used them. Trump has been proved right in the past. Perhaps he will be vindicated again. We shall see. There are many ways forward on how to gather more facts about this important matter. We should discuss them.