I’ve come across an interesting report on military research into disabling drugs. Normally, one would thing of things like tear gas, but here they are talking about hallucinogens, and “relaxing agents”.

Of note is that the use of such agents by the military is expressly forbidden under the chemical warfare treaties, on the theory that their use would inevitably lead to full blown poison gas use.

This is precisely what happened in the Iran/Iraq war, where tear gas use escalated into poison gas attacks.