You are incorrigible. It is not safe to make any of the self-serving assumptions that you seem intent on making about intelligence reports. In this case, it is likely that the report was prepared with a view to making the contents public. Clearly, there is keen public interest in the source of the sarin that killed the people in Khan Sheikoun and intelligence agencies have the expertise to produce such a report. At this point, all the evidence points to the Assad regime as the source of the attack: the gas was delivered by airstrike and the rebels don't have jets — spare us the song and dance about an errant regime airstrike hitting a rebel weapons dump. The rebels do not have sarin, which in any case is a binary weapon that is stored in an inert state to avoid that very hazard. Moreover, if the French are alleging that they have identified the use of hexamine as a signature element in the regime's sarin recipe, then you would need to refute that and not simply gainsay the allegation.