The British Medial association issued a press release  2 weeks ago on the use of drugs as "non-lethal weapons":

“It is disingenuous of governments to describe drugs as non-lethal – there is no difference between a drug and a poison except the dose. Using drugs as a method of law enforcement may constitute a violation of international conventions which prohibit the use of chemical weapons. This is of great concern to the BMA.”
(thanks, joan (german))