I see the cost part, but on managing the devices it would either require:
- centralising all the devices in one point and have one or two trained professionals do the injections, which means a significant delay in case of emergency
- or training every professor to do injections, which isn't hard in theory, but time and cost consuming, puts more burden and restrictions on the staff (how do you deal with a 60yo math teacher who just wants to teach and not manage health emergencies ?)
And we're not going into the kids and the school staff properly communicating to get the person in charge to shoot the pen when the kid feel they need it.