The 2013 White House assessment on the East Ghouta chem incident was later debunked.
The 2017 White House assessment on the Khan Sheikhoun chem incident was later debunked.
The 2018 White House assessment on the Douma chem incident will be debunked.
Last fall, the Organization for the Prohibition of Chemical Weapons (OPCW)-UN Joint Investigative Mechanism (JIM) determined Syria was responsible for the sarin attack on Khan Shaykhun in April 2017.
This has since been debunked or retracted?
Solid references, please.