Chemical weapons are rarely used only because they are not very effective. If they were effective they would not be outlawed. When we invent a version that wil

Chemical weapons are rarely used only because they are not very effective. If they were effective they would not be outlawed. When we invent a version that will be practical to use, (e.g. small hard to notice drone capable to spray highly poisonous chemical right in enemy barracks) all the "success" in outlawing we had will instantly disappear.