One of the earliest proposed chemical weapons, cacodyl oxide, or Cadet's fuming liquid, also displays properties of a blood agent ( as well as those of a malodorant ).
2.
Especially worthwhile would be the development of " calmative " gases that can calm large groups, or " malodorant " _ foul smelling _ gases that can repel them, says the report, titled " An Assessment of Nonlethal Weapons Science and Technology ."
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