I am not a nurse but I am a clinic substitute (and substitute teacher) for a local school system. Becoming a clinic sub didn't have any special requirements besides being CPR certified (if I remember correctly) and taking a day of training on things like common communicable dieases, first aid, allergic reactions, low/high blood sugars, how to handle meds, etc. I am restricted in that I can't be a clinic sub for any elementary or middle school that has diabetics.
I've done it for about 2 years (the upcoming school yr will be my 3rd yr) and must say that I don't see the big deal about a non-nurse filling in for the school nurse as a sub. Anything longterm requires an LPN or RN, and they instruct you in training to call 911 for anything heavy-duty. Also, there is an area nurse who is on-call for any emergencies or questions you may have. In the event that a school can't find a clinic sub if the school nurse calls out, usually someone in the front office (ie the secretary) has to handle the job for the day. There has been many a time that a school's front-office staff has been happy to see me walk thru the door. I save them the hassle of having to unlock the med cabinet every time a child needs their meds, from having to check the temp of every kid with a clinic pass, from having to call the parents of every kid with too many symptoms of illness, and so on.
I would like someone to explain why they feel non-nurses should not be allowed to operate the school clinic in the nurse's absence if they have had training to do so. To be honest, of all the schools I have subbed in clinics for, there hasn't been a single situation I was not able to handle. I've encountered some interesting situations in my 2 yrs as a clinic sub but nothing I didn't feel prepared for.
Having clinic subs serves a purpose. When a school nurse has to call out, it's great for the school system to have a group of trained people available on short notice.