Chemical Weapons in World War One

The active chemical in Belladonna is scopolamine which is what US police tried to use for decades as a truth serum but it just kind of is a moderately powerful hallucinogen that he was trying to disperse via grenade. World War One is obviously when chemical weapons get used for the first time on a mass scale and we all are aware of more or less what happens here. Adolf Hitler himself a victim of mustard gas refused in World War Two to give approval to the German military to use chemical weapons again as an offensive military tool. Right around the same time the Nazis are inventing sarin the empire of Japan is weaponizing anthrax during the war.