And yet, of course, if there are injuries, the teacher is held responsible.
That's why I submitted that if teachers are in a situation of "damned if you do, damned if you don't" it's just too bad a place to be in. Especially with everyone having spy phones, there are way too many mischievous imps (is that racist?) who like to set up a fight primarily to do in the teacher.
This is my second year of not doing inner-city substituting. It's a real excellent paycheck for a retired teacher, with lots of variety, adventure, and creative teaching opportunity. It reached a point where it's just not worth the risk of an injury or of some set-up situation.