(New Scientist) Syria's chemical weapons are supposed to be well on their way to destruction, yet several times in the last month, most recently on 30 April, the Bashar al-Assad regime has been accused of turning chemical weapons on civilians. This time it's chlorine gas.
This week UK newspaper, The Daily Telegraph, reported that it had sponsored a Syrian doctor to collect soil samples from alleged attack sites. An industrial gas detector picked up the signal of both chlorine and ammonia in the samples. They reported this as "proof that [the] Assad regime [is] launching chlorine attacks on children".
Does this count as proof?
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Not quite. Charges that the chemicals were launched by Assad, and not a rival rebel faction, rely on the assumption that only Assad's forces have helicopters.