I don't think you can trust Wikipedia to have the most relevant information on this issue.
This is within the province of state department classified documents and you would have
to query the CIA and MI6 for genuine information. Wiki's function is best served by non-political or biographical data. Remember who can post information to Wiki and all the sources quoted in the world will not reveal the truth of this matter. The fact is, that unless you are working for the CIA or agencies that are involved directly in this issue, you don't know what you're talking about. This is not a transparent issue.

Did the CIA use sarin? We don't know and no one on this thread knows unless they work for the CIA or other relevant agencies. In the meantime, the best we can do is wade through
the propaganda.