Maté has written extensively on the claims made by Organisation for the Prohibition of Chemical Weapons (OPCW) inspectors that the OPCW doctored a report on the Douma chemical attack in order to place blame on the Syrian government and justify missile strikes against Syrian government forces by the US, UK and France. In February 2020, Fernando Arias, the director-general of the OPCW, said the two inspectors had "manifestly incomplete information on the Douma investigation" and "their views were not backed by evidence." Maté wrote that Arias "dismissed the pair as minor players who refused to accept that their conclusions were 'erroneous, uninformed, and wrong.'"