Seymour Hersh, a Pulitzer Prize-winning journalist made some extreme claims in a recent article claiming Assad’s forces didn’t use chemical weapons near Damascus in August.  It’s been widely circulated.  It’s wrong.  Eliot Higgins writes a very detailed counter in FP.com.  where he systematically takes apart Hersh’s account.  Open source and the Syrian Army sources have identified two munitions were used in the 21 August attack, a Soviet M14 140 mm artillery rocket and a previously unknown munition that has appeared at multiple locations called a “Volcano”.  Volcanoes were used in a previous chemical attack on 5 Aug.  Higgins also outlines the geographic case for the location of Volcano launchers within 2.5kms from the site as well as the effort needed to generate sarin amounts exponentially greater than the sarin used in the Tokyo terror attacks of the 90’s.   There exists no evidence the rebels were capable of producing sarin while the Syrian military clearly has stocks.