Do teachers in your district not have to have a list of allergies and dietary restrictions in their substitute folder? That is one of the things we have to do by the first day of class. Not having that is REALLY asking for the school to be sued.]
I have a child in my class who is allergic to peanuts and both my assistant and I were trained on how to use the epi-pen. We didn't have to sign anything. I hope I don't have to use it, but I would be more worried if I didn't have the training and ended up NEEDING to use it.
At my old school, epipens were in the classroom, but at my current school, they are kept in the nurses office. The rationale is that any location can call the office and the nurse(or secretary) will come to the child. If it was in our room, time would be wasted figuring out whose room the child was in and where the epi pen was kept in the room.
Substitute folder? What's a substitute folder?

Okay,I exaggerate a bit,but I almost never have an official substitute folder when I get to a class. I can't tell you how many times I have had to call down to the office when I arrive at a classroom and don't have even a class roster for the day. Teachers,please,at the least put a class roster on your desks at the minimum every day when you leave,so if you are unexpectedly absent,at least the sub will know who is in the class!!