My grandson cannot bring a snack to school that isn’t in the original wrapper. My daughter can’t just throw a bunch of cookies in a ziplock bag. He also isn’t permitted a certain kind of pretzel because they are manufactured in a place that also makes peanut snacks. At lunch he MAY bring a PB&J sandwich because the peanut allergy kids have their own table.
At the age of 6 he can tell you just which kids have allergies and what they are.
My daughter can tell who has allergies too. I think the allergy children ought to have their own table away from the regular children but our school didn’t want those children singled out for some reason. I went through enough bs last year that I doubt I will ever be a class mother again. It was way easier with my now adult children. There weren’t as many rules or problems. If my husband would just agree I would gladly homeschool.