We live in Oregon and Portland Public Schools have a policy in place concerning food allergies. My granddaughter is allergic to peanuts. She has an epi-pen in the school office and in the after school care space. The school nurse trains all teachers in the use of the epi-pen.
Her mother did have to provide information signed by the doctor as well as a form signed by her. The form signed by my daughter was the same one signed by any parent giving the school permission to give medicine such as acetaminophen.
There is a policy of no peanuts in the classroom for the whole class to consume. Individual children can bring peanut products in their lunches and snacks unless there is a student who is so allergic that having them in the room would risk an attack. So far, my granddaughter is in the 4th grade, there has not been a severely allergic child.
One year the teacher asked that we bring boxed snacks to keep in the classroom for my granddaughter to eat when other mother's brought snacks for a party that would contain peanuts. In kindergarten the teacher asked that parent's not bring anything that contained peanuts. The teacher was very good at monitoring that.
In the school cafeteria they gave peanut butter sandwiches to students who had run out of lunch money. The cafeteria staff was very good at knowing that my granddaughter could not have peanut butter and provided something else for her. My granddaughter was also still allergic to milk protein in K and 1st grade. The cafeteria managed that quite well.
One advantage to having a food allergy is that staff know my granddaughter and because she is knowledgeable and co-operative she enjoys her special attention.
I'm surprised that your school is not familiar with peanut allergies and have a developed plan for managing them. There are 9-12 students with peanut allergies in a school of 400.
I don't know if Oregon has a law concerning allergies. My impression is that PPS has a policy based on need and not on the law. Your school's nurse or the Superintendents office should be able to answer your question concerning the law. There is a federal law known in the vernacular as No Child Left Behind that requires that school districts provide for the needs of children so that they can be successful in school. I suspect that managing food allergies would be included in it.
If the school is willing to work with you I wouldn't be concerned about the presence or lack thereof of a law.
As you've probably been told, most children outgrow food allergies that start when they're babies but not usually an allergy to peanuts. My granddaughter is participating in a nationwide study, thru her allergist, to determine if people can be desensitized to peanuts. She started with a infinitesimal amount of peanuts taken twice/day. The dose was gradually increased over weeks. She was up to having 8 peanuts twice/day when the pollen season struck causing asthma difficulties. They cut her back to 4 peanuts twice/day and she's doing fine.
Oddly enough, she hates peanuts and getting her to eat them is like giving her medicine. :):)
You can probably find information about this study by Googling peanut allergy desensitization. I first heard about it from my pharmacist.