I don't know. I was a substitute once. junior high math and science. And teachers suck, they go out of work, hardly leave any lesson plans. you walk in a class not knowing a thing of what is going on. Then the teachers don't know when they might get back, so you don't know how long you will even have this class. which at that pay grade is pretty much volunteer work. They didn't call me in anymore, I think because a child complained I was bouncing the basketball while I gave them a 7th grad math test. I guess I was distracting. And I was a smoker. so out side of school the kids would see me, and try to bum a cigarette off me. I didn't give them any. But I did notice some missing out of my pack in the teachers desk. Then I had one kid leave with a bathroom pass. I didn't notice he was gone until the next day when he walked in and put it back on the chalkboard.. That could have been why they stopped calling me back. But come on, you can barely take attendance anyway. you don't know any of them. They should just number the desks so you can call out number five, number eleven etc.
Eventually the real teacher comes back, sometimes to leave little notes "can you have them do this this this this , work on this this this," then they disappear for another week. so you are just kind of sitting there thinking, "crap. this is her class why don't she get her azz back here and have them do this, this this this this.......and no, im not bringing home this stack of crap to correct that lazy biatch"