Peace: perhaps you're right. We'll have to wait and see if anything comes of it. The only thing though is, if you are a doctor, you might see burns or marks on a body, and recognise that it is not a typical wound, and suspect that some kind of chemical agent cuased it, without actually being able to name the chemical or identify its structure. Identifying excatly what kind of chemical you are dealing with can take time in a laboratory and specialised equipment. Even the police, when they seize illegal drugs (even well known ones) have to send them to a lab for analysis to see if they are actually substances controlled by law (to identify exactly the chemical structure) before they can prosecute.
It may be that there is no truth to the allegations, until the tissue samples and substances are analysed we won't have a conclusive answer. I suppose they have had a good bit of time to study these chemical substances (you say July 20th?) so you'd expect them to have identified some of them by now if there were any. But I don't know how long these things take.