Chicago suburb Oak Lawn banned jell o ~ so, did the Chicago city school system ban it? Couldn’t find an article about the Chicago city schools actually banning anything except home-made lunches ~ (SEE: http://jonathanturley.org/2011/04/11/chicago-school-bans-homemade-lunches-to-protect-students-from-unhealthy-food-choices/ )
Maybe just the vicinity school like you found.