Why tear gas, lobbed at migrants on the southern border, is banned in warfare

[truebluefan]

Military recruits enter the chamber one by one and don protective masks. Tear gas swirls. Then, the order: Take off your mask and breathe. Eyes well and throats tighten, and men and women training for war uncontrollably gag.

Nearly every uniform is coated in snot. Some recruits vomit.

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