Tear gas canisters are "non-lethal", perhaps, but that's not the bar I think should be set. An example of the kind of thing that can happen: http://gothamist.c

Tear gas canisters are "non-lethal", perhaps, but that's not the bar I think should be set. An example of the kind of thing that can happen: http://gothamist.com/2010/06/01/cooper_union_student_loses_eye_in_w.php http://gothamist.com/2010/06/01/cooper_union_student_loses_e...