The USA conducted tests of the lethality of CS in the 1960s. It was determined that to be lethal to a monkey (LD 50) tear gas created by thermal grenades (or rifle fired canisters) woould require a concentration of 1,950 mg/cubic meter for an average of 32 minutes, for a total exposure of 62,400 mg.min/cubic meter. In the open this would be virtually if not absolutely impossible to achieve. Tear gas might have been a factor, but it is almost certainly not the primary cause of death.
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